The Houdini Cosy is the best tool for ensuring those blankets stay on during the night, and during chilly stroller outings  The Houdini Cosy keeps it user warm and snug. It keeps the blankets securely in place and stops them slipping off & being caught in the stroller wheels. Great for cots, single beds, bunk beds, strollers & wheelchairs  Simply slip the elastic under the cot matress or wrap it around the back of your stroller or wheelchair, and then grip the clips on either side of your blanket