The WHOOP Ultra-Soft SuperKnit Wristband for WHOOP 4.0 offers a gentle, comfortable feel for all-day wear. This 9.5-inch (24 cm) band is made of polyamide, polyester, and elastane. It's soft on the skin. So, it's easy to wear while sleeping, swimming, or showering. The SuperKnit band is designed for smooth use with strength training, helping your WHOOP 4.0 track your activity with precision. It features stainless steel parts, including a secure clasp and hook, which make it simple to attach and remove. With its soft material and snug fit, the WHOOP Ultra-Soft SuperKnit Wristband for WHOOP 4.0 is ready for whatever your day brings, giving you an easy and reliable way to wear your WHOOP device nonstop.