We created the Warm Fuzzy to help smooth your child's ride and to help facilitate something children do well in our strollers: sleep. Easily inserted into any stroller's seat, the Warm Fuzzy's thick polypropylene fleece panel and padded quilting add warmth and comfort to make your child's strolling hours more enjoyable. Our Warm Fuzzy works with both single and double strollers. (Works with individual seats of Duallie strollers)