Now I absolutely love and recommend this wind-stopping base, above the crew: simply because you get the option of zipping all the way up for the cold and blustery rides; or, un-zip as needed for venting. With the crew, you've no venting choice. It's worth the few extra $, I think.
Rode in 40F with winds 30mph., under Gores' ALP-X 2.0 winter jersey, and the Gore ALP-X 2.0 GT Jacket, and Gore's Windstopper tights. Topped it all off with Gores' Thermal cap, and the ALP-X Windstopper gloves...a few quick zips vented as needed along the ride; no problems!
(...hey Gore, I should get paid for this demo!)
Fit seems a bit more lean than the W.S. singlet base I just got (and will be returning, which ran a bit more generous, but way too long to fit under my road jerseys).
And, because it is a zip-mock, the "GORE" emblem isn't located front and center when venting the jersey...I like that!
Great ventilation on the back. Recommended!