The LaSportiva Tarantulace is an unlined leather climbing shoe with an asymmetric shape for advanced performance. The RN45 last is provides great performance but is still comfortable for all-day wear. The synthetic leather overlay lacing harness adds great support for beginner to mid-level climbers and the unlined leather is comfortable and soft. The aggressive rubber heel rand lets you stand in micro-edges and the FriXion RS rubber is hard wearing yet sticky for long life. This is a great shoe for gym or outdoor climbers who need one shoe to do it all.Midsole: 1.8mm LaspoFlex.Sole: 5mm FriXion RS.Weight: 9.3oz (260g).