Using a tape measure

sits at the base of the mast and acts as turning point for the mainsheet and outhaul and cunningham ropes

you don't need a side

Sheave Ø (mm) 57 mm

Musto Evolution Stretch Deck Short Size:38 Using a tape measureThese stylish, versatile Deck Shorts benefit from 2 way stretch fabric and a gusset in the crotch that promotes excellent freedom of movement. A UPF 50 rating means that your legs are protected against harmful UV rays, so you can safely enjoy spending more time outdoors. Deep cargo pockets provide great storage opportunities. This is a certified bluesign product. These Men's Deck Shorts are designed to make you look and feel good wherever you wear