Bold, wild and beautiful. The new Siren climbs with unrivaled strength and precision. The lightweight lace-up has out-of-the-box comfort and an amazing fit. It's designed for all-around performance, from faces to cracks to indoor bouldering. Five Ten sourced a special perforated synthetic for more comfort and and more breathable upper. This shoe is ideal for gym climbers working on intermediate to advanced problems, or outdoor climbers who want a comfortable shoe that performs really well up to 5.11 or 5.12 (after than, you'll want the Women's Anasazi).