The Pulse gives you a unique fitting system to ensure that you Find Your Fit. By producing this all-around model in two different volumes, you can now fine tune the length and volume of your climbing shoes between the Positive (High Volume, Blue) and the Negative (Low Volume, Red) versions. Constructed with a breathable mesh upper, speed-lacing system, and EVA Shock Heel this model is sure to jump start your climbing! Classification: All Around High Performance. Closure: Lace. Stiffness: 3. Shape: Asymmetric. Toe Patch: TPR. Toe Patch Thickness: Variable. Midsole Material: Compressed Polyester. Heel: 3D Molded PHH. Color: Red and Blue.