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The women's REI Airflyte Running tights are perfect for cool-weather runs on the trail, street, treadmill or wherever your workout takes you. Breathable stretch-woven fabric offers lightweight insulation and quick-drying, moisture-wicking comfort; 4-way stretch lets you move freely. Fabric provides UPF 50+ sun protection, shielding skin from harmful ultraviolet rays. Mesh insets behind knees vent heat, and ergonomic shaping offers a fit that conforms to your stride. Side-ankle zippers provide easy dressing; reflective details enhance visibility. Zippered lumbar pocket secures workout extras and centers them on your back to prevent jostling. Gusseted crotch reduces irritation, and flat seams reduce chafing. Overstock.