Outdoor Research ActiveIce Spectrum Sun Long Sleeve Tee - Women's

Outdoor Research's ActiveIce Spectrum Sun Long Sleeve Tee for women is built to keep your body temperature in check while hiking, backpacking, climbing, or setting up camp. This long-sleeve shirt is built with a quick-drying polyester blend treated with proprietary ActiveIce technology. ActiveIce reacts to your body's rising temperature by cooling down your core, keeping you in the sweet spot longer while pushing the tempo or working hard. The chafe-free design, built-in stretch, and UPF 50+ are welcome essentials for long days spent under the sun, and thumbholes at the ends of the sleeves deliver sun protection that stays in place while reaching for the next hold or setting the pace on the trail. Purpose-built for staying cool while spending long days in the mountains under the sun, Outdoor Research's ActiveIce Spectrum Sun Long Sleeve Tee is a go-to for every outdoor enthusiast.

• Integrated thumb loops for added sun protection
• Side slits at hem for easy movement
• Interior center back loop for easy hanging
• UPF rating 50+ sun protection shields you from harmful rays
• Summer 2025 product

High UPF Sun Protection Rating

UPF (ultraviolet protection factor) refers to the fraction of UVA and UVB rays that can get through a textile. For example, UPF 15 means that 1/15th (or 6%) of UV rays can get through the fabric. Not all pieces of clothing are equal. Fabric type, construction, color, and chemical treatments are some of the biggest influencing factors. The higher the UPF number, the greater the sun protection, with 50 usually being the highest.

ActiveIce™

ActiveIce™ is the best-selling sun protection technology that actively cools you as you sweat. More efficient and effective than ever before, ActiveIce™ now features the same thermo-regulating formula as Outdoor Research’s proprietary ActiveTemp™ technology, allowing it to dynamically adjust to your body's temperature to cool you faster when you need it most. Every ActiveIce™ product is infused with UPF 50+ sun protection, and is breathable, lightweight, quick drying, and wicks moisture as you sweat. Choose ActiveIce™ whenever you plan to spend time in hot, exposed, sun-baked conditions.