Designed for long days in the saddle, the Mavic Ksyrium Ultimate Shoe is built to do two things keep you comfortable and deliver power to the pedals. Comfort starts with Mavic's EndoFit tongue, which snugly wraps around the top of your foot without pinching. The Ergo Dial fit system lets you achieve the perfect fit without the need for laces or ratchets. Even the Ergo Fit 3D Ortholite and EVA footbed is designed to cradle and support your foot.The real business end of the Ksyrium Ultimate is the Energy Carbon outsole, which provides a stiff platform for pedaling and a super low 7mm stack height for optimized energy transfer. Cleats can be adjusted a full 5mm in each direction for a completely custom pedal interface. The best part' The shoe weighs well under 300 grams, even with all of its luxury features.