Vibram's V-Trek Insulated pairs 360° fleece insulation with a non-absorbent, water-shedding shell to deliver warmth and flexibility for cold-weather urban and outdoor use. Key attributes: Black | Polyamide and polyester blend | Insulated for cold conditions | Water-shedding / non-absorbent shell | Lightweight and flexible | 4mm rubber outsole for traction | 360° fleece-lined collar, tongue and quarter panels | Protective film on and between toes | Lace-up closure | Five-toe construction | Brushed toe fabric | Low-top sneaker silhouette | Dimensions & fit: Weight M43: 7.8 oz | Weight W38: 6.2 oz | Composition & care: Upper: Polyamide and polyester blend | Insole: 4mm soft polyurethane + heavy fleece sockliner | Outsole: 4mm rubber | Machine wash cold, air dry