Band & Adapter Guide

WHOOP 4.0 to 5.0/MG Band Compatibility & Adapter Guide

Everything you need to know about Whoop band types, 4.0 vs 5.0 compatibility, choosing the right band, and keeping your collection alive with adapters.

See 4.0 vs 5.0/MG compatibility

Choosing the right WHOOP band depends on your wrist size, skin sensitivity, and use case. SuperKnit is the most popular all-day band; Hydroknit is built for water and sweat; silicone bands suit hot showers and pools. WHOOP 4.0 bands don't fit the new 5.0/MG sensor — but a Whoopal adapter makes them compatible in seconds.

Whoop Band Types Explained

Whoop offers a wide variety of bands and body-worn accessories, giving you the flexibility to wear your device in whatever way suits your lifestyle and activity. Here is a breakdown of the main band types available across the Whoop ecosystem:

SuperKnit

Whoop's signature woven fabric band. Breathable, comfortable for all-day wear, and available in dozens of colors and patterns. The most popular choice for everyday use.

Hydroknit

Designed for water sports and high-sweat activities. Quick-drying material that prevents waterlogging. Ideal for swimmers, surfers, and heavy sweaters.

SportFlex

WHOOP's perforated stretch fabric. More structured than SuperKnit, with tiny holes for maximum airflow. A popular alternative for users who find knit bands too soft or prone to slipping during high-intensity training.

Silicone

Durable, easy to clean, and water-resistant. A great all-around option for gym workouts, outdoor activities, and anyone who wants minimal maintenance.

Leather

Premium look for professional and social settings. Not ideal for workouts due to sweat absorption, but perfect when you want your Whoop to look dressy.

Metal

Stainless steel or titanium options for a luxury feel. Heavier than fabric or silicone bands. Best for formal occasions or users who prefer a watch-like aesthetic.

Bicep & Body Bands

Wear Whoop on your bicep, calf, or other body locations. Useful for activities where a wrist band gets in the way, like CrossFit or weightlifting.

Whoop also partners with brands for limited-edition and co-branded bands, so new styles appear regularly. The key thing to understand is that all bands connect to the Whoop device through a clasp system — and this is where compatibility between generations becomes important.

Collection of Whoop 4.0 bands in various colors and materials

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WHOOP Band Sizes

Measure your wrist with a soft tape just below the wrist bone, then match the circumference to a band size below.

Size	Wrist circumference	Best for
XS	130-145 mm	Children & petite wrists
S	145-165 mm	Smaller adult wrists
M	165-185 mm	Average adult wrists
L	185-210 mm	Larger wrists & forearms

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Whoop 4.0 vs 5.0 Band Compatibility

This is the single biggest pain point for long-time Whoop users:

WHOOP 4.0 bands do NOT natively fit the WHOOP 5.0 or MG devices.

When Whoop released the 5.0 and MG, they changed the clasp mechanism. This means if you upgraded your Whoop device, your entire collection of 4.0 bands became incompatible overnight. For users who invested in multiple SuperKnit bands, limited-edition drops, or premium leather and metal options, this is a frustrating and expensive problem. Replacing an entire band collection at full retail price can easily cost hundreds of dollars.

Band Generation	Fits Whoop 4.0	Fits Whoop 5.0 / MG	With Adapter
Whoop 4.0 bands	Yes	No	Yes (w/ adapter)
Whoop 5.0 / MG bands	No	Yes	N/A

The bottom line: if you have Whoop 4.0 bands and a 5.0 or MG device, you need an adapter to make them work together. That is exactly the problem Whoopal was built to solve.

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The Whoopal Adapter Solution

The Whoopal adapter is a precision-engineered connector that bridges the gap between your Whoop 4.0 bands and the 5.0/MG clasp system. It is a small, lightweight piece made from durable PETG plastic that snaps onto your 4.0 band and allows it to fit the new clasp mechanism perfectly.

Whoopal adapter connecting a Whoop 4.0 band to a 5.0 clasp

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Here is what makes the adapter work:

Simple snap-on installation. No tools, no modifications to your band. Just snap the adapter on and attach to your 5.0 or MG clasp. Takes seconds. See our step-by-step installation guide.
Minimal profile. The adapter adds barely any thickness or weight. Most users forget it is there after the first few minutes of wearing it.
Durable PETG construction. PETG is resistant to sweat, water, and daily wear. It will not crack, warp, or degrade with regular use.
Available in 7 colors. Black, blue, gray, green, red, silver, and yellow — so you can match your adapter to your band or make it invisible.
Affordable. A single adapter costs a fraction of what you would spend replacing even one premium Whoop band.

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Shop Whoopal Adapters

Keep all your Whoop 4.0 bands alive on your 5.0 or MG device. Available in 7 colors with worldwide shipping.

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How to Choose the Right Whoop Band

With so many options available, choosing the right band comes down to your primary use case. Here are some guidelines:

For Everyday Wear

SuperKnit is the go-to for most users. It is breathable, soft against the skin, and comes in the widest range of colors and patterns. If you only own one band, make it a SuperKnit.

For High-Intensity Workouts

Silicone or Hydroknit bands handle sweat better than fabric. Silicone is easier to wipe down between sessions, while Hydroknit dries faster after getting soaked. For CrossFit or weightlifting, consider a bicep band to keep your wrist free for barbell work.

For Water Sports

Hydroknit is purpose-built for water. It will not absorb water weight the way fabric bands do, and it dries quickly once you are out. Silicone is also a good option for casual swimming.

For Professional or Social Settings

Leather and metal bands give your Whoop a more polished look. Pair a leather band with business attire or a metal band for formal events. Just remember to switch back to a sport-oriented band before your next workout.

For Sleep

Comfort is king during sleep. A soft SuperKnit band or a well-broken-in silicone band works best. Avoid metal bands for sleeping — the weight and hard edges can be distracting and affect your sleep quality, which in turn affects your Recovery Score and HRV.

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Band Care and Maintenance

Proper care extends the life of your Whoop bands and keeps them comfortable and hygienic. Here are the essentials:

Clean regularly. Rinse fabric bands with warm water and mild soap after sweaty workouts. Silicone bands can be wiped with a damp cloth or alcohol wipe. Do not use harsh chemicals or bleach.
Dry thoroughly. After washing, let bands air dry completely before wearing them again. Wearing a damp fabric band for extended periods can cause skin irritation and odor buildup.
Rotate your bands. If you have multiple bands (and with the Whoopal adapter, all your 4.0 bands are still in play), rotate them regularly. This gives each band time to dry and reduces wear on any single one.
Know when to replace. Bands that are stretched out, fraying, or have persistent odor despite cleaning should be retired. A worn-out band can affect sensor contact and data accuracy, since Whoop needs consistent skin contact to measure heart rate and HRV accurately.
Store properly. When not in use, store bands flat in a cool, dry place. Avoid leaving leather bands in direct sunlight or humid environments.

Manual

Learn How to Install the Adapter

Step-by-step visual guide to attaching the Whoopal adapter to your Whoop 4.0 band.

View Installation Guide

Questions

Frequently Asked Questions

01Will my Whoop 4.0 bands work with Whoop 5.0?

Not natively. Whoop changed the clasp system between the 4.0 and 5.0/MG generations. However, with a Whoopal adapter, you can use all your 4.0 bands on the new clasp. The adapter snaps on in seconds with no tools required.

02Does the adapter affect sensor accuracy?

No. The adapter connects at the clasp point, not the sensor area. Your Whoop device sits against your skin exactly the same way it would with a native 5.0 band. Sensor readings — including heart rate, HRV, and skin temperature — are unaffected.

03How many adapters do I need?

One adapter per band. The adapter stays attached to the 4.0 band, so if you rotate between three bands, you will want three adapters. Many users start with one to test the fit and then order additional adapters for their full collection.

04Can I use third-party Whoop bands with the adapter?

The Whoopal adapter is designed for official Whoop 4.0 bands. Third-party bands that use the same 4.0 clasp dimensions should also work, but compatibility depends on the specific manufacturer's tolerances. We recommend testing with one band first.

05What colors are available?

The Whoopal adapter comes in 7 colors: black, blue, gray, green, red, silver, and yellow. Black is the most popular since it blends with most band colors, but matching your adapter to your band color creates a seamless look. See all color options.

06How do I size a WHOOP band?

Measure your wrist with a soft tape just below the wrist bone, then match the circumference to the size table above. WHOOP bands are typically adjustable within a 20mm range.

07Best WHOOP band for working out?

SuperKnit and Hydroknit are the standard recommendations for high-sweat workouts — they wick moisture and dry fast. Silicone bands work for swimming but trap sweat against skin during sustained training.

08Can I wear my WHOOP band in the shower?

Yes. All WHOOP devices and official bands are water-resistant to 10 ATM (100 m), so showering, swimming, and water sports are fine. Silicone bands are the easiest to rinse clean. Hydroknit dries fastest. Avoid soaking leather or metal bands for extended periods.

09How do I clean my WHOOP band?

Rinse fabric bands (SuperKnit, Hydroknit) with warm water and mild soap after sweaty workouts and air dry. Wipe silicone bands with a damp cloth or alcohol wipe. Never use bleach or harsh chemicals. Leather bands should be wiped dry immediately after contact with water. Rotate bands regularly so each one fully dries between wears.

Not an official WHOOP product. WHOOP is a trademark of Whoop, Inc.