Fit my WHOOP great, very nicely made seems sturdy. Unfortunately the fabric interacted with my sensitive skin and gave me a rash after I wore it for about 30 minutes.. I had the zigzag pattern Onyx Black and the only part that irritated my skin was the underside where the strap is folded back on itself and the "top" zigzag fabric was folded against my skin. I might try one of the standard solid color straps in the future and see if that also gives me a rash, I was sad because these seem like nice alternatives to the extremely expensive Whoop straps.
