Aritzia Butter Cheeky High-Rise 5in Bike Shorts in Slate Gray. Size S. A signature style called cheeky for a reason, these are high-rise bike shorts with a curved waistband specially designed to emphasize you know what. Plus, our perfected gusset, waistband and shaping design create a flattering fit and freedom to move. They’re made with BUTTER — barely there, buttery soft sweat-wicking fabric that shapes to your body.