Mountain Hardwear Crater Lake Long Sleeve Tops - Men's Dark Storm XL. While you're soaking up that Vitamin D the Crater Lake Long Sleeve Crew has you protected from unwanted UV rays thanks to its UPF 50+ fabric. This lightweight and comfortable top also pulls double duty as a breathable baselayer when the clouds roll in and it's time to layer up. Specifications for Mountain Hardwear Crater Lake Long Sleeve Tops - Men's: Manufacturer: Mountain Hardwear Sleeve Length: Long Sleeve Age Group: Adults Apparel Fit: Regular Gender: Male Application: Outdoor Fabric/Material: Solar Knit Jersey 88percent Polyester 12percent Elastane Features of Mountain Hardwear Crater Lake Long Sleeve Tops - Men's Uses: Backpacking Rock Climbing Hiking Camping Broad Spectrum filters out harsh UVA and UVB rays UPF 50+ Recommended by The Skin Cancer Foundation HeiQ Mint plant based odor control technology Soft jersey knit with moisture wicking properties Low profile thumbholes MHW heat transfer logo at left chest Package Contents: Mountain Hardwear Crater Lake Long Sleeve Tops - Men's Mountain Hardwear 1982421-004-XL: Crater Lake Long Sleeve Tops - Men's 004 XL