Non-marking sticky rubber with added durability at the heel. Ideal for use on land, in boats, and in less demanding wading conditions. Felt or studs are recommended for more demanding wading conditions. Construction: Non-marking sticky rubber with added durability at the heel Reduced Water Absorption: Keeps them lightweight and helps reduce the spread of invasive species. Fit: Match the sole size with your OmniTraxA(R) 3.0 boot for an exact fit.