Cuckoo Bicycle Covers® are stretchable one piece covers designed to provide a tight fit for Road Bicycles, BMX’s and Mountain Bikes. The covers are made with a fabric consisting of 82 % Nylon/Lycra and 18% Spandex. The unique triangular design makes it easy to install by opening and closing front and rear zippers. An optional lock to hold the two zippers together can offer reasonable theft protection of bicycle parts. Cuckoo Bicycle Covers® were designed to provide your bicycle protection from road dirt, oil, pebbles/stones and UV rays during road transport.