The Al tra Lone Peak All - Weather Mid is an ideal choice for any outdoor excursion, especially on winter hikes through often snowy, wet, or muddy Sierra trails. The boot features a water-resistant upper and an all-new Duratread outsole made of dense rubber and improved for wet conditions, so you can have confidence in any terrain. The Altra EGO foam midsole with a 25 mm stack height provides moderate cushioning with added energy return so you can enjoy your adventure in comfort. With the proprietary FootShape and Balanced Cushioning 0 mm drop, your feet sit comfortably and naturally, allowing you to go further.