Neutrally Buoyant UPF 50+ DWF - Durable Water Repellent Hypo-allergenic Thumb Holes Sunglass Loop Super Comfortable 4-way Stretch Spend a lot of time in the water? Lavacore's Lavaskin shirts provide UPF 50+, abrasion protection, a super comfortable fit and they look great too. A new series of an intermediate garments below the LavaCore Polytherm level of performance, but more warmth than a traditional Lycra Rash Guard.