Ninja with the top down. If you feel claustrophobic in a hood, prefer classic mock neck base layer, or just like to let your hair blow in the wind, the Hoodless Ninja Suit is the base layer for you. We highly encourage you to step in, zip up, and enjoy the superior coziness of complete body coverage... with the top down. Trademark Ninja Suit 350 degree waist zip is standard, providing easy bathroom breaks, and Air Tech fabric wicks moisture to keep you warm.