TREO Fabric: The cornerstone of BlackStrap's lightweight fabric technology. TREO is a Breathable, performance knit synthetic blend with 4-Way Stretch, Quick-Dry, and has Odor-Free attributes. TREO is highly Abrasion-Resistant with a Soft-Touch next-to-skin feel. Treo is also Machine Washer and Dryer Safe, Moisture-Wicking, Lens-Safe, and features SpectraUV (UPF 50+).