Tri-Mountain Performance 122 - Momentum weighs 5 oz. It is made of 100% polyester pique. Cause it is a crewneck shirt, you can give yourself a nice look in summer. Features the UltraCool system, developed to control and manage perspiration. Constructed with a half-moon yoke back, square bottom and open cuffs are its charming features. There are some colors have the extended colors sizes. Buy one and you will truly like the design and colors.