Arena Men's Swimwear Size Chart This sleek and conservative silhouette is designed to offer maximum coverage and support in a low-drag design for optimal speed and hydrodynamics. With an 18 in. length, the jammer offers coverage from mid-waist to above-the-knee, while an internal drawstring allows for maximum adjustability and comfort. Made with Arena's most advanced and longest-lasting fabric, MaxLife, it delivers maximum comfort, range of motion, and chlorine resistance for the most demanding competitive swimmers, while maintaining superior softness, durability, and performance all season. Features: - 18 inch outseam - MaxLife fabric is comfortable, long lasting, and mobile - Internal drawcord - Low drag design - 100% Polyester