Altra Women's Lone Peak II Trail Running Shoe 100% Air Mesh Imported Rubber sole Lace-up trail runner featuring breathable mesh upper with rear pull-on loop FootShape toe box Fully cushioned Zero Drop platform. D on the product box does not indicate width. W indicates Women Contoured footbed with StoneGuard rock protection. Carbon rubber outsole with uphill and downhill lug traction The Instinct Runs slightly shorter in size. If you are between sizes please go up 1/2 size larger than your regular size