While Specialized might call the Eureka a jersey, it’s really more like a jacket that’s perfect for cooler days. It combines soft, stretchy and fleecy panels, while waterproof and windproof material is used in the areas you’ll most need it, along with the pockets.
The Eureka isn't completely windproof, but it does keep a lot of the chill out without being too hot like some tops. This combination of materials makes for plenty of restriction-free movement and a snug fit.
There's room under it for a base layer but not much else. Even so, we were comfortable on moderate training rides down to about 10°C (50°F) and breathability remained good for all but the most intense workouts
Rather than using elasticated cuffs that can sometimes be irritating, Specialized has opted for zipped cuffs, which work well with gloves. Add a high collar and elasticated waist, and all draughts are sealed out.
While the shoulders feel a little odd at first, they’re perfect when you reach out to the bars and start riding.
Rounding out the Eureka are four rear pockets, a siliconized lower hem, full front zipper and reflective detailing for low-light visibility. The Fieldsensor material proved resistant to snagging.