Keen Revel IV Mid Polar Men's Winter Hiking Boots - Size 42.5

On a frozen ridge at dawn, the Revel IV Mid Polar keeps your feet warm and sure-footed. Built for winter hiking and snowshoeing, this boot combines a waterproof leather and mesh upper with KEEN.WARM insulation rated to -40°F, so you can stay out longer in bitter cold. The KEEN.DRY membrane seals out slush and snow while letting sweat escape, and the thermal heat shield footbed reflects warmth back to your foot. Underneath, the KEEN Polar Traction outsole with 5mm multi-directional lugs bites into ice and packed snow for reliable grip on steep, slippery terrain.

Key specifications

• Insulation: KEEN.WARM Recycled PET, rated -40°F / -40°C
• Waterproofing: KEEN.DRY breathable membrane
• Upper: Waterproof leather and performance mesh
• Lining: Fleece for added warmth
• Outsole: KEEN Polar Traction, non-marking, 5mm lugs
• Midsole: Dual-density compression-molded EVA
• Footbed: Thermal Heat Shield
• Toe protection: KEEN.PROTECT rubber toe bumper
• Closure: Lace-up with speed hooks
• Shank: Stability shank
• PFC-free water repellent
• Environmentally preferred premium leather

Why choose it

The Revel IV Mid Polar is engineered for extreme cold without the bulk. Its recycled PET insulation delivers serious warmth, while the stability shank and dual-density midsole provide support on uneven, snow-covered trails. The KEEN.PROTECT toe bumper shields against rocks and ice, and the PFC-free treatment keeps the leather dry without harmful chemicals. From deep snow to icy switchbacks, this boot gives you the confidence to push further.

Ideal use cases

• Winter hiking on snow-packed trails
• Snowshoeing in deep powder
• Cold-weather backpacking and trekking
• Everyday winter wear in extreme conditions

Good to know

This boot is built on a men's-specific last for a secure, comfortable fit. The KEEN.WARM insulation is made from recycled PET bottles, reducing environmental impact. The KEEN.DRY membrane is breathable, preventing overheating during high-output activities. The thermal heat shield footbed adds an extra layer of warmth underfoot, while the stability shank provides torsional rigidity for confident footing on uneven terrain.