However you want to wear it - under a wetsuit, under Lavacore full suit, stand alone or paired with Lavacore shorts - this extremely versatile vest covers your core organs from the elements - at an affordable price. Flexible, durable and water repellant/resistant outer layer, Windproof and breathable middle layer, Warm, moisture-wicking, anti-bacterial inner fleece layer, Extended material on back to keep vest from riding up, Lightweight and 4-way stretch, Lavacore is neutrally buoyant, All seams are overlapped during flatlock sewing, UPF 50+ protection