SEA TO SUMMIT DELTA MUGThe lightweight Delta Mug features an ergonomic rim for a easy sipping. The Nylon 66 material is doubled up along the top edge forming a hollow gap between the cup and the rim so fingers are protected from hot liquids. The mug also has Sea to Summit's(R) unique hex pattern base which reduces weight and is cool to touch.FEATURESProtex hex pattern disperses heatBPA-free, food grade Nylon 66Ultra-durable Nylon 66 can withstand high heat and cold temperaturesOdor- and stain-resistantDishwasher safeNot for use in microwaveTECH SPECSMATERIAL(S): BPA Free Food-grade glass-reinforced polypropylene