The Peak Boys Energy 1.5mm Short Sleeve Spring Suit is a competitively priced spring suit that is suitable for surfing, paddle sports, diving in warmer climates and basically anything that you need a bit of extra core warmth. View the entire Peak range here! Peak Boys Energy 1.5mm Short Sleeve Spring Suit Features: 1.5mm thickness: 1.5mm used throughout the wettie. High-quality Neoprene: Stretchy, soft and warm. Flatlock Seams: A durable seam that's built to last. Learn more. Back Zip entry: Simple and easy to wear, extra long pull-tab! Learn more.