A silicone strap is a flexible band or belt made of a material called silicone, which is often used to secure or hold something in place. Full definition
We've been wearing the black silicone strapped version, which is matched to a colorful bezel with blue highlights around the inner watch face. (digitaltrends.com)
This combined with a super flexible silicone strap makes for a very comfortable wear. (techradar.com)
Both came with classy stainless steel straps, although there are leather and silicone strap options too. (thenextweb.com)