- Anatomically correct H-shape for comfort . High quality Pima cotton for durability . Pima cotton is highly moist absorbent . Elasticated waistband for optimized fit These trunks are crafted from some of the finest cotton available: Pima cotton. Pima cotton is upgraded quality and comfort and ensures highly comfortable wear all day. Add long-lasting stretch and strong recovery in the waistband and you have the ultimate trunk fit.