Great fit per provided chart. Flexible in 3mm thickness. Dual Zipper is awesome if Nature calls" while topside. "Open Box" was no concern as item came brand new in a clear bag with all tags still attached. Would buy another Open box from this company without question. Might buy the 7mm as well. Other reviews said it was too stiff & recommended the 3mm. But based on the flexibility of this version, the 7mm is probably plenty flexible. While its not lined inside with Merino type wooly liner, the Neoprene material IS fabric backed both inside & out, so no rubber-to-skin material that gets stuck. The full length zipper and single leg step-in makes donning/doffing the suit very easy. Great as a stand-alone suit, or as part of a long John bottom 2 piece set or 3 piece w hood.