Plain Felt Sole: Compressed high-quality felt performs in extremely slippery water conditions. Traction: Ideal for slick aquatic environments where felt is allowed and studs aren’t an option. Studded Felt Sole: When you need something with more bite than Plain Felt. Application: Ideal for extremely slippery aquatic environments where felt is an option. Traction: Same sole as Felt, only with 26 carbide-tipped studs per pair. Ideal for extremely slippery wading environments where felt can be utilized. Fit: Match the sole size with your OmniTrax 3.0 boot for a perfect fit. Studded Vibram Idrogrip Sole: When you need something with more bite than Plain Felt. Application: Ideal for extremely slippery aquatic environments where felt is an option. Traction: Same sole as Felt, only with 26 carbide-tipped studs per pair. Ideal for extremely slippery wading environments where felt can be utilized. Fit: Match the sole size with your OmniTrax 3.0 boot for a perfect fit.