Demon Zero RF D3O Unisex Ski/Snowboard Knee PadsAll new for 2024, the Demon Zero RF Snowboard Knee pads. Super comfortable and not too bulky, they're designed to seamlessly fit under your snowboard pants. The D3O RF layer (Recycled Foam) is ingeniously combined with ESPRO polymeric material technology, resulting in a knee pad that's both durable and flexible.D3O Recycled Foams used on the knee padD3O uses patented, patent-pending, and proprietary technologies to make rate-sensitive, soft, flexible materials with high shock-absorbing propertiesD3O® Recycled Foams contains two grades of D3O® ZeroTM materials. This recycled material is the latest innovation from impact protection experts at D3O Zero RF D3O Unisex Ski/Snowboard Knee Pads