Superman has the 'Do not disturb sign' up tonight because he's snuggled up in his Muscle up onesie from Primark. Check out this super soft cosy mens onesie with front zipper and elastic wrist and ankle cuffs.
Size Guide: This item is made to be baggy, so buy for your height!
Our onesies are made of comfortable stretchy fleece so they are easy to size. The most important sizing criteria is height. To help you, we have provided an approximate height range. If in doubt take the next size up. Onesies are designed for an oversized fit and are much more comfortable that little bit bigger.