Vans Mountain Mule Whether fresh off the mountain or fresh out of bed, the Mountain Mule provides unparalleled comfort and style with the convenience of a slide. Slip it on and stay warm with 100-gram insulation. Plus, a Standard Snow MTE outsole offers reliable traction in all conditions. Mule design with low-profile back for easy on and off 100-gram insulation for reliable warmth in cold conditions Full rubber lugged outsole for traction across varied terrain Full-grain leather and textile upper for durability and structure Leather upper for a smooth, durable finish