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The Beneunder Women's Lightweight Breathable Sun Base Layer UPF 50+ is designed to offer ultimate comfort and protection. Made from ultra-light fabric with UPF50+ sun protection, this base layer provides excellent coverage against harmful UV rays. The back neck area has been optimized to provide additional sun protection, ensuring you stay safe from the sun without sacrificing comfort. Its quick-dry and breathable fabric offers cooling benefits while being soft and lightweight. This base layer is perfect for active days in the sun, offering full-body protection with an enhanced, stylish fit.
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Lightweight Sun Shirt That Does It All
- Built with UPF50+ yarn-based tech to block ≥99.5% of UV rays—protects against sunburn and premature aging.
- High neckline and extended thumbholes shield your neck and hands from sun marks and color contrast.
- Lightweight and breathable for next-to-skin wear—no need for extra outer layers, just wear and go.

Slimming Fit That Feels Good and Stays Fresh
- Tailored 3D fit with structured shoulders, double-C waist contour, and a curved hem—flatters your shape.
- Neutral, easy-match colors perfect for both work and weekends.
- Infused with 5A antibacterial protection that lasts through 100 washes—safe and hygienic for daily wear.

1.5x Cooler Than Standard—Built for Heat
- Cooling index 1.5x higher than national standards—feels cool instantly and reflects heat away.
- Quick-dry yarn dries in just 3 minutes—sweat evaporates fast to avoid cling or discomfort.
- Absorbs moisture 2.3x faster than regular fabric, keeping you fresh even when sweating.

Sheer-Free But Fully Breathable
- 30D ultra-fine anti-see-through fabric—just 0.3mm thin, yet blocks underwear visibility.
- Breathability rating of 221mm/s ensures you stay dry, cool, and covered all day.
- Wear it solo or under a sun jacket—no lines, no sweat patches, no worries.