Alpinestars RK 1 Plasma Knee Brace John Deere Your braces come with two Size:Adult XL Your braces come with two different optional thicknesses of Patellar Shell Pads so that you can get the brace to fit as snug as possible against the sides of your knees If you are looking for something for colder climates Nucleon PLASMA is a viscoelastic material engineered from bio based polymers and formed into a structure that is pliable in all directions while maintaining the ability to dissipate impact energies the replaceable triple segmented knee cups are backed with a Nucleon PLASMA protector for the optimum blend of impact protection