The Women's Siren Long-Sleeve Mock shirt has all the features of our original Barrier line, with a few new tricks up its water-resistant sleeves. Featuring seamless underarms, a woman-specific fit, four-way stretch, water-repellent fabric, flat-lock seams, and 50+ UPF protection. This updated Siren line also features banded cuffs for a snug seal at your wrists, contrast-color side gussets, and a new back zipper to allow heat release and easier removal.