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. Itís designed for all-around performance, from faces to cracks to indoor bouldering. With a perforated mesh upper, not only does the Siren keep your feet nearly 20% cooler than most other climbing shoes, it fits better too. Great choice for the female climber who wants a comfortable shoe that performs well bothinside and out.