Gore Bike Wear make an astonishing range of jackets, including some casual styled ones, but the Helium is an unashamed performance bike mac. This means you get a comedy long penguin tail for keeping your bum dry and a multi-panel cut that's a perfect close fi t on the bike.
The tall collar is unlined but snug enough and the velcro-adjustable sleeves are loose enough to pull up for cooling down. No pub style points though.
The Windstopper fabric used here doesn't claim to be waterproof but it takes a fair deluge to drown you properly. The great benefit is that it wicks well enough to dry out sweat or rain leakage quickly, so you warm up again even if you've been working hard.
There are no extra vents to blow wind through but the sleeves are mesh lined to stop wet arms getting wind chilled too quick and if you're just cruising it doesn't steam much at all.
As you'd expect for a racy shell, it doesn't have any pockets or extra trimmings but this keeps the weight right down and allows the jacket to pack down to a 'can of beans' size for easy pocket stuffing.