Designed for Extreme Surface use. – High Impact outer shell with textured, non-skid surface for security on slick or uneven surfaces. – Comfortable, flexible 1/2″ foam rubber pad interior. – Sturdy dual 5/8″ leather straps with buckle secure pad. – Two wide elastic straps fasten above and below knee. – One size fits all. – Designed for Heavy Duty extreme surfaces: quarries, mines, construction sites, demolition, concrete, rock, metal and rough or uneven surfaces. – Good surface grip and protection from ragged metal edges for welders and roofers.