The moment it arrived, I suited up. that was hours ago and I am still wearing it. I ordered mine with crotch/rear zipper with attached socks and gloves. I went with the standard thickness and Medium men's size. I would swear it was custom made for me. The fit is so perfect. I am going to be sad to take it off.
We have a lot of zippers on our products here and a lot of options for zippers. A lot of times our patterns come with a pre-set selection, but we can customize more. Locking, WaterTight and even air-tight zippers are sometimes requested as customization features. You can always ask for a quote for something via the "I'd like to customize this product" link on any page. Meanwhile, here's a simple picture to explain the type of zippers and what they are called.