Speedo Men's Boy's Variegated Lanes PowerPLUS Swimsuit Briefs 79% Nylon / 21% Xtra Life Lycra Up to 50% lighter than traditional performance swimwear PowerPLUS compression technology increases muscle support PowerPLUS also resists pilling, fits perfectly and retains its shape use after use 79% Nylon / 21% Xtra Life Lycra PowerPLUS fabric adds power and decreases recovery times