This ultra lightweight Ripstop button-down wicks away moisture and shields from the sun—ideal for fishing or just enjoying the outdoors. Ventilation at the back offers the ultimate in cool-wearing comfort while a rod holder at the chest frees up their hands. It’s a performance classic featuring a powerful combination of our Omni-Shade UV-blocking protection with Omni-Wick moisture-wicking technology. Columbia offers this youth-sized short sleeve in multiple colors and sizes. Regular Fit. To ensure the size you choose is right utilize our sizing chart and the following measurement instructions: To determine the neck size measure at the base or thickest part of the neck. For the chest measure at the fullest part of the chest under the armpits and over the shoulder blades keeping the tape measure firm and level.