True to its name, this Race Day ultra light vest has been crafted for a barely-there feel. Using a comfy blend of nylon and Lycra, this singlet has NB ICE technology which moves moisture and promotes airflow to help you stay cool under pressure. 74% Recycled Nylon, 26% Lycra , Crew Neckline, Side Bonded Slits at Hem, Reflective NB logo, New Balance. New Balance Race Day Ultra Light Singlet Black.