Columbia Long Sleeve Sun Shirt Columbia Sportswear Omni-Shade™ - Blocks damaging UVA and UVB rays. Breathable, sweat-wicking fabric. Size - Small Color - Black Measurement at underarm is slightly over 18 inches. Relaxed fit. Long sleeves can be rolled up with button tabs. Spare button still attached to fabric tab. The "Omni-Shade" printed on the inside of the collar faded with washing (pictured). Dolly's Treasures is always a clean, smoke-free, dog friendly environment.