- Introducing the Arctic Sport II Ankle. This new style is crafted from Muck"s traditional hand laid rubber. To reduce weight and increase flexibility, we utilized our Muckskin technology. This technology features a printed rubber coating over neoprene that is 100% waterproof, 100% MUCKPROOF and abrasion resistant. This new ankle height allows for an easy on/off experience for all your wet, cold chores.