Weatherproofness
Once again, Outdoor Research’s Seattle roots are evident in this jacket’s design, as it puts up a good fight against cool drizzles. The fabric beads up water amazingly well and dries pretty quickly, to boot. Many of its well-designed features—the thumb loops, the cinch cords, the stay-put hood—also help effectively seal out wind.

Breathability
Though the fabric itself breathes relatively well, there are no vents at the underarms or back to help body heat escape. If you’re really pushing the pace, the Tantrum can feel somewhat steamy inside after a while.

Function
There are lots of things to praise in this category, beginning with the subtle thumb loops that help keep the sleeves in place, especially on windy runs. Likewise, cinch cords on both the hem and the hood do a great job locking wind out. From a durability perspective, the stretch fabric and high-quality seams hold up well. A zippered pocket at the chest is handy for securing small essentials, while the larger Velcro-closured rear pocket is ideal for stashing a hat or gloves—or the Tantrum jacket itself, when not in use.

Fit/Comfort
Running slightly big, the Tantrum offers a great, roomy fit. The slight stretch in its fabric adds to its comfort, not feeling restrictive in any area. Its comfy, gently elasticized hood and cuffs are nice touches as well, with handy cinch cords to really dial in the fit.

Packability
Although at least an ounce heavier than most other jackets in this review, the Tantrum offers a unique packability feature. We admit we were skeptical at first of what seemed like a hokey design gimmick—the integrated strap in the large, Velcro-closured rear pocket that can be mobilized as a sort of waist belt for hands-free toting of the Tantrum jacket when you’re not wearing it. However, it’s surprisingly easy to deploy and actually quite handy for taking an emergency layer with you on shorter runs when you don’t want to carry a pack—but still want some weather insurance.