Worn twice. Already cleated for indoor cycling. Purchased at my studio. Great condition! EU 37.5 No box The Slipstream is a performance cycling shoe that doesn't sacrifice the style and comfort of your favourite pair of trainers. With its breathable mesh toe box, slip-on construction, and single-strap closure system, it's the most comfortable shoe you'll ever wear to class. Cycling shoes should fit slightly tighter than your other trainers. If you have a narrow foot it is recommended choosing half a size down from your usual trainer size, otherwise stay true to your usual shoe size.