Rubber's tough, but you can't beat felt when it comes to killer grip on slick rocks. Accordingly, you can count on the Simms Headwaters Men's Felt Boot to keep you upright when rocks are rolling underfoot and algae is growing all over. This super-grippy boot features a rugged and easy-to-clean nylon and rubber upper, a partial neoprene lining to help your feet stay warm and comfortable, and a dual-density EVA midsole for all-day support. Simms also hooked the boot up with a full-coverage retention plate that provides some support and makes it easy to attach studs, and built the boot on its Headwaters platform for increased stability and comfort when you're spending more time in the water than on dry land.