This cosy, super king fleece underblanket is the perfect thing for making your bed even warmer, and the extra deep fit ensures it won’t move around during the night. Cosy Cover Add a layer of fleecy warmth to your bed with our deep fitted, fleece underblanket. Designed to fit underneath your sheet, this cosy mattress cover ensures you’ll stay toasty in bed throughout the night. Fully Elasticated for a Secure Fit Available in single (90 x 190 cm), small double (120 x 190 cm), double (135 x 190 cm), king size (150 x 200 cm) and super king size (180 x 200 cm), this protector can snugly accommodate up to a 30cm deep mattress thanks to the deep fit and fully elasticated skirt. 3/4 of the under blanket is covered in fleece, with the remainder left free for your pillow space. Please note that all measurements are approximate.