Design: Engineered air mesh upper blends stretch and structure with just-right breathability New material is breathable while providing necessary warmth for cold-weather runs Water resistance helps keep out snow and rain Reflective hits improve visibility in low-light conditions In-Shoe Comfort: Nitrogen-infused DNA LOFT v3 cushioning delivers soft, smooth cushioning that adapts to your unique stride for lightweight comfort mile after mile. Durability & Traction: Outsole rubber is designed to provide enhanced traction on snowy or rainy surfaces Additional Details: Offset: 12mm To achieve CarbonNeutral(R) product certification for this style, Brooks(R) increased use of recycled materials to lower carbon emissions, then support carbon offset projects to neutralize the emissions that cannot be eliminated