Now with a highly-perforated, triathlon-specific upper, the SIDI Women's T4 Air Carbon Triathlon Shoes maximize drainage and ventilation, plus the soft, brushed interior ensures sock-free comfort, fast transitions and supreme performance on the bike leg. Women's last is narrower across the ball of the foot and offers less instep volume and a lower heel cup. Twelve Carbon Composite sole ensures excellent power transfer while abrasion-resistant Politex upper repels water and won't lose its shape. SIDI Heel Cup positions the foot inside the shoe to reduce slippage and enhance pedaling efficiency. Tongue-free design, heel loop and notched top strap allow lightning-fast shoe entry. Opposing pull straps secure the fit and are easy to adjust while riding.