These knee pads have a gel-filled liner sewn right into them so the gel stays where you need it. The straps are comfortable too – a contoured mesh strap, along with an elastic upper strap, both have hook and loop closures so they can be adjusted to fit any size leg perfectly. Two 1" wide straps adjust from 5-1/4" to 10". The co-polymer knee pad cover slides easily on smooth surfaces, like your tile and hardwood flooring jobs, yet it is textured so you don’t slide away! Made in China.