Ella's refined, frameless silhouette sits low against the face, and that kind of fit usually makes venting an afterthought. The Sario MIPS Helmet's Stack Vent finds Ella's top vent anyway, clearing warm air at the source instead of letting it build up behind a slimmer frame. What Our Gearhead® Experts Are Saying:"Ella sits low against my face, and I expected some fog to sneak in behind that frame. It hasn't, through storms and bluebird days both."