Hydra 4.5 Here

: While the membrane is waterproof, reviewers note that in high temperatures (above 25°C), the insulation can lead to significant heat buildup and damp feet from perspiration. Comfort and Fit

: The boot is built with a sturdy frame to protect the ankle from rolling or twisting. Hydra 4.5

: This technology is highly effective at keeping your feet dry during creek crossings or heavy downpours. : While the membrane is waterproof, reviewers note