Tec-Proof is a 100% waterproof and breathable porous membrane.
Manufactured by Hi-Tec to be extremely strong, the Tec-Proof membrane offers full waterproof protection whilst still allowing the foot to breathe through its microporous surface.
Each pore is larger than a gas moisture particle, but smaller than a water particle. So why excess heat and moisture is able to escape from inside, water may not enter from the outside.