NEW SIZING. Please note, we have adjusted our sizing and now our zips fit about one size bigger. We do still recommend to purchase true to size, but they are now meant to have more room to grow. This zip one piece is super soft and comfortable. Featuring a zipper that runs from the top of the outfit to the ankle. Our favorite part about this outfit is that the zipper is 2 way! Making for super easy diaper changes without having to remove the whole outfit. The fabric we used is super stretchy and breathable, made from bamboo viscose, wait until you feel how soft it is! These run about one size big leaving room to grow but are meant to have a slim fitted look to them.