Fitcent Super Soft Adjustable Band Replacement Strap Compatible with WHOOP 4.0 and WHOOP 3.0 Heart Rate Monitor

Really great quality for the money. I love that it's silicone, and particularly happy after seeing some of the wearable bands have PFAsMake sure to put it on pretty tight or the heart rate will sometimes not register

This didn’t even last a month before the buckle broke apart. Charging is hard as others have mentioned but after spending 20 or so minutes (and asking my boyfriend for help) I found out that the pack is supposed to go over the silicone housing because the open side groove to get the side arms of the pack seated for charging doesn’t extend to the edge of the whoop housing. This seems like a design flaw that will eventually lead to breakage of the whoop housing portion of the band (if your buckle doesn’t break first).The only pros for this band for me are that the band doesn’t hold water due to the silicone like most of the options from the company and the metal they use for the buckle did not give me a skin reaction like the silicone band I bought from whoop.

So this is actually a very decent product. I wear this all night as well as with every without and there are no issues.... It's comfortable on my wrist and when it works well you can even slide on your whoop charger with no problem... Unfortunately durability is an issue. I've had this for a month and it's already coming apart... I'm hoping I got a bad batch but definitely not a good look.