https://www.tsesafety.com/product/pro-pocket-knee-savers/

Product Details

Pro Pocket Knee Savers
Supreme Flexibility
Rough work conditions are no match for TSE Safety
High Grade Closed Cell Foam. This foam has excellent memory
keeping its shape no matter how rough you work.

True Comfort
TSE Safety Knee Savers are designed to fit most major brand double
knee work pants. Combined with our extremely lightweight
foam, your pants will not be uncomfortably weighed down.

Easy Convenience
The advanced technology of High Grade Closed Cell Foam allows
you to be able to wash your double knee work pants without
removing the Pro Pocket Knee Savers! Dry on low to medium
settings to maximize the life of your Knee Savers!