Since the electrode pads are pre-gelled

Fabric: 50 percent Polyester/50 percent PBT Four Way Stretch technology providing a body hugging fit

worn end cap and a Lizard Skin grip

Also featured is the R2 resin for added durability with no dip in performance

New Duofold Men's Heavyweight Expedition Double-Layer Thermal Shirt XX-Large Blk XX-Large:Black Since the electrode pads are96% Polyester, 4% Spandex base layer underwear closure Machine Wash 4 way stretch for snug fit and miosture control Drop tail to help keep your shirt tucked in Flatlock seams to avoid irritation Odor resistant fabric Tagless labels for more comfort