Cinctus Adjustable Nylon Band for Fitbit Air - Astra Straps Cinctus Adjustable Nylon Band for Fitbit Air - Astra Straps
Cinctus Adjustable Nylon Band for Fitbit Air - Astra Straps Cinctus Adjustable Nylon Band for Fitbit Air - Astra Straps
Cinctus Adjustable Nylon Band for Fitbit Air - Astra Straps Cinctus Adjustable Nylon Band for Fitbit Air - Astra Straps
Cinctus Adjustable Nylon Band for Fitbit Air - Astra Straps Cinctus Adjustable Nylon Band for Fitbit Air - Astra Straps
Cinctus Adjustable Nylon Band for Fitbit Air - Astra Straps Cinctus Adjustable Nylon Band for Fitbit Air - Astra Straps
Cinctus Adjustable Nylon Band for Fitbit Air - Astra Straps Cinctus Adjustable Nylon Band for Fitbit Air - Astra Straps
Cinctus Adjustable Nylon Band for Fitbit Air - Astra Straps Cinctus Adjustable Nylon Band for Fitbit Air - Astra Straps
Cinctus Adjustable Nylon Band for Fitbit Air - Astra Straps Cinctus Adjustable Nylon Band for Fitbit Air - Astra Straps
Cinctus Adjustable Nylon Band for Fitbit Air - Astra Straps Cinctus Adjustable Nylon Band for Fitbit Air - Astra Straps
Cinctus Adjustable Nylon Band for Fitbit Air
Cinctus Adjustable Nylon Band for Fitbit Air - Astra Straps
Cinctus Adjustable Nylon Band for Fitbit Air - Astra Straps
Cinctus Adjustable Nylon Band for Fitbit Air - Astra Straps
Cinctus Adjustable Nylon Band for Fitbit Air
Cinctus Adjustable Nylon Band for Fitbit Air - Astra Straps
Cinctus Adjustable Nylon Band for Fitbit Air - Astra Straps
Cinctus Adjustable Nylon Band for Fitbit Air
Cinctus Adjustable Nylon Band for Fitbit Air - Astra Straps
Cinctus Adjustable Nylon Band for Fitbit Air - Astra Straps
Cinctus Adjustable Nylon Band for Fitbit Air
Cinctus Adjustable Nylon Band for Fitbit Air - Astra Straps
Cinctus Adjustable Nylon Band for Fitbit Air - Astra Straps
Latest

Cinctus Adjustable Nylon Band for Fitbit Air

Cinctus Adjustable Nylon Band for Fitbit Air

Regular price $39.99
Regular price $69.99 Sale price $39.99 Save $30.00

In Stock - Fast Shipping With USPS

Band Color: Deep Blue
Band Width: Fitbit Air

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  • Free Shipping Orders $50+
  • Easy Returns
  • 100 Days Guarantee
  • Less than 0.5% of buyers use our money-back guarantee

Wrist or arm, you decide. The Cinctus gives you the flexibility to wear your Fitbit Air as a traditional wristband or move it to your bicep for more accurate heart rate tracking during lifting, cycling, or any exercise where wrist placement gets in the way.

Features:

  • Dual Wear Design works as wristband or armband
  • Premium Lightweight Nylon feels soft and breathable
  • Adjustable Stainless Steel Clasp provides customizable, secure fit
  • Quick-Dry Material recovers fast after sweat and moisture
  • Slim Profile stays streamlined without bulk
  • Sweat- and Wear-Resistant handles intense activity
  • Soft Woven Texture feels comfortable against skin
  • Durable Construction withstands daily use and workouts
  • Available in 8 Colors to suit your personal and unique style

Details & Compatibility:

  • Fits Wrist Size:
    • 6.9” - 10.2” (175mm - 260mm)
  • Fits Arm Size:
    • 9.8” - 15.75” (250mm - 400mm)
  • Compatible With: Fitbit Air

Shipping and returns

Shipping

We offer FREE Tracked shipping on all orders over $50! For orders under $50 we charge $4.95. 📦

We offer Shipping to Canada, United Kingdom, Australia and New Zealand.

We process orders between Monday and Friday. Please note that we require 2 to 3 working days on average to fulfill your order before dispatching it. Rest-assured we are doing everything in our power to get your order to you as soon as possible! 

Once your order is dispatched, depending on your country or region, estimated delivery time is between 5 to 10 business days. Please consider any holidays or global events that might impact delivery times.



Returns

We offer hassle-free returns to our nearest dispatch center. To start a return just contact our support team at support@astrastraps.com and we will make the process easy and effortless.

PLEASE NOTE: Due to delays caused by huge pressure on international and local shipping companies, orders may be delayed for arrival.

Our guarantee

The Astra Standard
Engineered for quality. Protected by our guarantee.
Premium Build
Rigorous QC checks ensure every strap meets the highest tier of durability.
100-Days Guarantee
Full coverage against defects, Faults. 
Insured Shipping
Free tracked shipping over $50. We cover any loss in transit.

Size guide


At Astra Straps, all our bands have clear and specific sizes indicated. Please check the sizing guide below before ordering. If you are still unsure, you may contact us here.

1. How do I know my wrist size?

Simply use a flexible measuring tape to wrap around your wrist and record the measurement on the tape that overlaps the zero end of the tape OR just grab any string/paper strips to do the same, then lay the string on a ruler to get your accurate wrist size.

In most cases, knowing your wrist size/length will be sufficient. Check your wrist size against the size of the strap that you wish to purchase on the individual product details page.

From there, you can select and purchase our watch straps: Small (S), Large (L) or Free Size.

2. What is the watch band width / watch lug measurement?


In certain cases, knowing your wrist size alone may not be sufficient. In such a scenario, you will need the watches' band width size, also know as the watch lug width size.

Your Apple watch will say the measurement on the back.

If you cant find the size on the back place the watch with the watch face facing up. Take the measurement of the distance between the lugs (where the watch strap fits).

For Apple Watches the you have the choice between 38MM, 40MM, 41MM, 42MM, 44MM, 45MM & 49MM, you can also enter your watch model number into a search engine to find what size your watch uses.

Apple Watch 7, 8, and 9: The Apple Watch Series 7, 8, and the newly released Series 9 are compatible with a wide range of our bands, including sizes 38MM, 40MM, 41MM, 42MM, 44MM, 45MM, and 49MM. For watch cases, they fit the 41MM and 45MM sizes.

Apple Watch Ultra and Ultra 2: The recently introduced Apple Watch Ultra and Ultra 2 are compatible with 45MM and 49MM bands. As for the watch cases, both the Ultra and Ultra 2 models are available in a 49MM size.

Using these three measurements, you are now ready to grab your band!

Ask a question

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Cinctus Adjustable Nylon Band for Fitbit Air - Astra Straps
Cinctus Adjustable Nylon Band for Fitbit Air - Astra Straps
Cinctus Adjustable Nylon Band for Fitbit Air - Astra Straps

Questions? We've Got Answers! ⭐

Real talk about your new favorite watch band

Will this actually fit my watch?

Absolutely! Whether you’re rocking the original Series 1 or the latest model, we’ve got you covered. Just check the size on the back of your watch (if you're not sure), and we'll handle the rest. It’s that easy.

Are third-party Apple Watch Bands safe to use?

Yes. All Astra Straps use precision-machined stainless steel connectors that lock securely into your Apple Watch — the same mechanism Apple uses. They won't scratch your watch or interfere with sensors like heart rate or blood oxygen. All our materials are skin-safe and nickel-free, and using a Astra Straps band does not void your Apple Watch warranty.

What makes Astra Straps different?

Great question! At Astra Straps, we don’t just make bands – we craft them.

Every single band is hand-finished to ensure the highest quality and attention to detail. We’re all about combining top-notch materials with unique designs that reflect your personal style.

Plus, we test every band for comfort and durability, so you can count on a strap that’s as strong as it is stylish. When you choose Astra Straps, you’re not just getting a band – you’re getting a piece of wearable art.

What if I don’t love it?

We get it – sometimes things just don’t work out. If you’re not in love within 100 days, send it back, no questions asked. We’ll refund you, no drama. We want you to have a band you absolutely love.

When will it get here?

We’re all about speed. Most orders ship within 1-2 days, and you can expect it to arrive shortly after.

Plus, if you spend over $50, shipping is on us. Because let’s be real, no one wants to pay extra for shipping.

Is it really comfortable, or just good-looking?

Why settle for one when you can have both? Our bands are designed to look amazing and feel just as great.

We’ve obsessed over comfort, so you don’t have to. No weird pinching or “I need to take this off” moments – just a band that feels as good as it looks.

Will it stand up to my crazy life?

We’ve put our bands through the wringer because we know you don’t have time to baby your watch.

Whether you're hitting the gym, caught in the rain, or dealing with your most accident-prone friend, these bands are built to last. Bring on the hustle!

How do I pick the right size?

Most people use a tape measure (or even just a string) to wrap around their wrist, then add half an inch. But don’t stress – most of our bands are super adjustable, so unless your wrists are tiny or extra large, the standard size should work just fine. Still not sure? Reach out to us, we’re here to help!

Do I need to buy anything else?

Nope! We believe in keeping things simple. Everything you need is in the box. No sneaky extra fees or “must-have” connectors. Just open it, snap it on, and you’re good to go.

How do I keep it looking fresh?

Super easy! Silicone bands just need a quick rinse with soap and water. Leather ones? Just a gentle wipe down.

Metal ones can be cleaned with a soft cloth. And don’t worry – we’ll send you a full care guide, but these bands are pretty low maintenance.

Ready to fall in love with your watch again? Join the 100,000+ people who can't stop showing off their Astra bands.

  • 5 stars: 44 (90%)
  • 4 stars: 5 (10%)
  • 3 stars: 0 (0%)
  • 2 stars: 0 (0%)
  • 1 star: 0 (0%)
C
Caleb Northwood
The texture makes the difference

That woven-looking surface gives the band a much more interesting finish than a plain rubber strap. Army green is a great choice.

B
Blaire Sutton
Finally, a wider adjustment range

The size range is what caught my attention. Having room to adjust the band is important when I'm exercising.

W
Warren Pike
Looks sharp with casual clothes

I really like the deep blue. It has a sporty appearance without looking like something meant only for the gym.

E
Estelle Bradford
That clasp design is clever

The rectangular metal adjuster gives it a clean finish. I like how the strap loops through instead of having a row of holes.

M
Mitchell Voss
Army green all the way

This is the exact kind of muted green I like. Not too bright and not too brown. Looks fantastic with charcoal clothing.

F
Fiona Marsh
A different kind of fitness band

The woven nylon and sliding clasp make this stand out from the usual silicone replacements. Nice change of style.

R
Reid Lancaster
Deep gray is underrated

The charcoal shade looks really refined in the close-up. I prefer it over black because you can see the texture more clearly.

G
Giselle Moreno
Gym gear without the flashy colors

I like that these shades are mostly understated. My workout clothes are already colorful enough, so the black is ideal.

J
Jasper Keene
WOAH, love that woven finish!!!

The tiny textured pattern is what sold me on the design. It looks so much nicer than a completely smooth band.

H
Helena Cross
Great-looking everyday option

The simple rectangular clasp and solid colors make this feel more versatile than a heavily patterned sport strap.

O
Owen Bellamy
Sizing details are helpful

I appreciate the stated range, although I'd still recommend measuring your wrist before ordering.

V
Veronica Shaw
The wine red is gorgeous

That dark red has so much more character than basic black. I love how it looks against the dark metal hardware.

H
Hugo Kendrick
For people who prefer nylon

I like the idea of a woven band rather than something completely smooth. The adjustable construction is another plus.

M
Marissa Vale
Starlight looks classy

The warm cream tone is subtle and polished. It would pair beautifully with neutral clothing and a simple watch face.

D
Damon Pierce
The navy is perfect

Deep blue has that professional look I want for work but still feels appropriate for running or weekend activities.

A
Alina Rutherford
No unnecessary decorations

Just textured nylon, metal hardware and an adjustable loop. That's exactly the straightforward design I prefer.

C
Cedric Lowell
Interesting clasp arrangement

I like how the strap threads through the metal frame. It looks more adjustable than a traditional fixed-hole band.

Q
Quentin Harwood
Good color choices for men too

Army green, deep gray and navy are all solid options. I'd probably choose two and rotate them.

M
Melanie Frost
Not sure about white for workouts

The white looks really clean, but I'd be concerned about visible dirt after outdoor training. Dark blue is probably safer for me.

T
Tristan Cole
Looks great in the gym photos

The band has a rugged but tidy appearance. I especially like the way the dark metal frame contrasts with the navy material.

V
Vivienne Doyle
The subtle pattern is excellent

You don't notice the tiny woven pattern immediately, but up close it adds a lot of visual interest.

R
Russell Camden
Something different from silicone

I've been looking at alternative strap styles, and this textured nylon design is a refreshing change.

E
Elara Benson
Olive green with black hardware

Such a good combination. The army green material and dark metal accents complement each other really well.

S
Shane Whitfield
Adjustable without lots of holes

The continuous strap and slider arrangement is appealing. It looks neat and avoids the usual perforated-band appearance.

N
Nina Westfall
A mature sporty look

Not every fitness accessory needs bright neon colors. The wine red and gray options have a much more understated feel.

B
Brody Fairbanks
Would like more size examples

The adjustable range is useful, but I'd love to see this modeled on both smaller and larger wrists for comparison.

C
Cassia Lennox
That blue is SO good!!!

The deep blue has a really rich tone. It's the first one I'd pick from this collection.

D
Dominic Hayesworth
Perfectly simple styling

I appreciate the absence of logos or printed graphics. The fabric texture provides enough detail on its own.

K
Keaton Rhodes
For my morning training routine

The lightweight nylon construction sounds well suited to regular workouts. I also like the option to fine-tune the fit.

I
Imogen Phelps
Love the light gray version

It has a modern, almost silver appearance. The dark clasp makes a nice contrast against the pale material.

M
Marshall Quinn
A band that doesn't scream gym

The design looks equally suitable for sitting at a desk or heading out for a run. That's what appeals to me.

R
Roxanne Fielding
The black looks seriously sleek

Black fabric with dark hardware is a combination that rarely goes wrong. This one has a nice textured finish.

T
Theo Madsen
Minimal but not boring

The weave adds depth, while the metal frame gives the whole band a more structured look. Nicely balanced design.

Why 100,000+ Customers Choose Astra Straps

390+ Styles. Premium quality. Prices that actually let you switch it up.

Endless

Style

Match every mood,
outfit, occasion

Premium

Materials

No cheap

plastic here

Built

To Last

Survives workouts, adventures, life

Perfect

Fit

Comfortable

from day one

100 Day

Warranty

We’ve got you covered for 100 days

  • “I recently got the Astra Apple Watch band and am very impressed with its quality and stunning design. Right from the packaging, it was clear this band was made with great care. The premium-grade silicone is soft against the skin, comfortable for all day wear, and durable enough for an active lifestyle. Im thrilled with my purchase."

  • “Don't waste money on expensive Apple bands. This one is stylish, fits well, and is excellently made. You can get several of these for the price of one official band."

  • “Ive had many Apple watch bands over the years, and this is the best, coolest, and most comfortable one yet. It makes the watch look extremely upscale. A friend paid much more for the same band elsewhere and couldn't believe my price. Highly recommended. Love!"

  • “Amazing quality, very flexible and not stiff like other straps. Doesn't have that cheap band smell. Highly recommend, and great to have the option to match the strap color with my style."

  • “I was looking for a band thats not only exceptionally comfy but also stylish and durable. These bands tick all those boxes. I appreciate the bands design where it tucks in neatly. My original band caught on everything, but this one has a much smoother design. I love it!"

  • “Astra Straps' customer service is top-notch. I had a question about sizing, and they responded promptly with helpful guidance. It's refreshing to see a company that values its customers."

  • “Astra Straps has been a game-changer for my watch collection! Their bands are not only stylish but incredibly durable. I've swapped out all my old bands for Astra and couldn't be happier."

  • “The watch bands fit perfectly around my wrist as there are plenty of holes to adjust to my wrist size. The colors are very nice. The feel of the band is smooth. The way the band clasps is a plus as it is very secure on my wrist."