Speed Box 3.0 100% making this outsole the most

making this outsole the most responsive in the fizik range

adjustability and low weight – maximizing your comfort and speed

In the world of triathlon bike aerodynamics

so let's start there

- Improved ERG support

Speed Box 3.0 100% making this outsole the mostZipp's Speed Box 3. 0 is designed to mount securely to a bike's top tube to hold nutrition and small items conveniently within reach. Featuring solid molded EVA construction, water resistant zippers, and 3 point Velcro attachment, the Speed Box 3. 0 is a lightweight, easy to use alternative to traditional saddle bags. Speed Box 3. 0 : 31 cubic inches 85g Solid molded EVA construction Water resistant seam sealed zippers Three point Velcro strap