Size S/M (refer to sizing guide photo) If you opt for a onesie, we think you’ve got it all figured out. You’re literally zipping up happiness all over your body. It’s like being coated in our softer-than-soft undies. It’s honestly heavenly, so do yourself a favor. Our softer-than-soft MicroModal literally grows from trees. Sustainably-sourced beechwood fibers are spun into a yarn to create a natural fabric that is not only super-soft, but breathable, static-resistant, and impossibly cozy. 92% MicroModal, 8% Elastane Tapered cuffed leg Center front zipper Hood with a drawstring Relaxed fit Ethically Sourced Low Impact Dyes Natural, Sustainable, Breathable Fibers Imported Under Fair Working Conditions.