The black Wills shorts are part of the REISS collaborative collection with sportswear label Castore. They're crafted from technical stretch jersey in two layers: the underlayer compresses the muscles for improved performance. They're fitted with a comfy elasticated waistband and feature reflective logos for good visibility in low light. Elasticated waistband. Side pockets. Reflective logos. Quick drying. Breathable. Lightweight. Compressed under shorts. The model is wearing a size M.