Icebug Women's Metro BUGrip-W Synthetic Rubber sole Icebug Women's Metro BUGrip Studded Traction Winter Boot Rubber BUGrip outsole with 16 carbide tip studs for traction on slippery surfaces Warm fleece lined, suede or nubuck upper with convenient medial side zipper Elastic, non-abrasive top collar with Achilles pull loop for easy on and off Abrasion resistant baseline trim for durability Comfortable running shoe platform with stabilizer -4F/-20C Comfort Zone