Permanent High-UPF Solar Protection and Technical Microclimate Regulation

The Patagonia Women's Long-Sleeved Capilene® Cool Sun Shirt is a specialized, ultra-protective technical base layer precision-engineered for long, relentless days of sun exposure on open water, alpine trails, and high-desert terrain. Meticulously crafted from a lightweight 100% recycled polyester jersey, this high-performance top stands as Patagonia's most sun-protective technical tee, delivering a robust 40+ UPF sun protection rating. Utilizing an advanced single-knit fabrication process, the shirt creates a dense, purely mechanical barrier against ultraviolet rays—meaning its protective properties are built directly into the yarn structure and will never wash out or degrade over time.

Engineered to maintain premium temperature regulation during intense, high-output mountain and river efforts, the technical fabric pulls sweat instantly away from the skin to optimize evaporative cooling. The interior face features a specialized textured anti-cling back knit that subtly lifts the shirt off your skin, maximizing interior airflow and preventing the fabric from sticking when you sweat. Tailored with a motion-friendly feminine silhouette, it features ergonomic set-in sleeves to eliminate restriction while rowing, casting, or pole-planting, combined with low-profile flatlock seams that sit completely flush underneath a running vest, climbing harness, or heavy pack straps.

Key Features:

• Permanent 40+ UPF Sun Defense: High-density single-knit structure blocks harsh UV rays naturally without relying on chemical or topical surface treatments.
• 100% Recycled Polyester Jersey: Eco-conscious performance textile provides excellent, low-bulk durability and rapid-drying capabilities.
• Textured Anti-Cling Backing: Advanced internal fabric geometry lifts the shirt away from the skin to channel cooling airflow and stop sweat cling.
• Ergonomic Set-In Sleeves: Tailored shoulder seams ensure a full, natural range of motion and prevent bunching or rubbing under technical harnesses.
• Chafe-Free Low-Profile Seams: Assembled with flatlock stitching across high-friction zones to protect sensitive skin from trail chafing.
• Extended Wrist Protection: Long-sleeve profile provides extensive wrist-to-shoulder coverage to keep your arms shielded from direct and reflected water glare.
• Fair Trade Certified™ Sewing: Responsibly manufactured in a certified apparel workshop, ensuring safe conditions and premium wages for the assembly team.