These round toe boots were constructed with 7mm Neo-Tech waterproof insulation and are 100% waterproof. They have easy on handles and BLOOM eco-friendly, algae-based EVA foot bed that helps clean polluted water habitats. The Dura Fresh natural bio-technology activates to fight odors. These pull on boots are made of a durable, hand-lasted rubber with a four-way stretch inner bootie and have a 90 degree heel for support on rough uneven terrain. Comfort rated to -40°F/-40°C.