Contact information, map and directions, contact form, opening hours, services, ratings, photos, videos and announcements from Halfdays, Sportswear Store, Denver, CO.
Own the Mountain
Olympian-founded and designed in Colorado, Halfdays is mountain-ready performance fashion with a mission to introduce more women to the outdoors.
04/29/2026
Performance, noted.
Meet the GwenUV Skort: designed with UPF 50 for sunny days, a built-in liner that stays put, four cargo pockets, and moisture-wicking fabric for whatever mountain adventure you get up to.
04/24/2026
May is all about getting outside and soaking up the sun.
Join us all month long for community events embracing the outdoors, in partnership with . From our GwenUV pieces to Freaks of Nature’s sun protection, we’re all about sunny days with our girls.
Select attendees will receive a Peak Performance Sun Stick or Daily Defender SPF from Freaks of Nature.
RSVP at the link in our bio.
From sketch to sun-ready streets: our Design Director Annice breaks down how our GwenUV Collection came to life.
Every detail is performance-first: breathable mesh underarms, moisture-wicking fabrics, and lightweight UPF 50 layers built to move with you. It’s sun protection you actually want to wear—trail miles, hot laps, or city strolls included.
Available everywhere you shop Halfdays.
04/21/2026
Same sun. Different personalities.
GwenUV, styled for all-day plans (and no plans).
04/18/2026
What is UPF? Here’s the breakdown. ☀️
UPF (Ultraviolet Protection Factor) measures how much of the sun’s UV rays a fabric blocks. UPF 50, like in our GwenUV jacket, pant, and skort, blocks about 98% of harmful rays — keeping you protected without extra layers or sunscreen.
Our GwenUV fabric combines this protection with breathable mesh, moisture-wicking fabric, and lightweight design, so you stay covered, cool, and comfortable whether you’re on the trail or in the city.
Shop the GwenUV collection at Halfdays.com
04/17/2026
Sun overhead. Trails wide open.
We celebrated our GwenUV launch the only way we know how — a sunny hike with our girls in LA.
No shade breaks, no outfit compromises. Just lightweight protection that handles high exposure and keeps its cool when the miles stack up.
UPF, but make it performance fashion. ☀️
04/06/2026
The Bastille Trail Pant, named in honor of Anne LaBastille — a writer, ecologist, and backcountry pioneer who built a life of radical self-reliance in the Adirondack wilderness.
Anne LaBastille didn’t just go into the wild. She made a life there. Cabin-built, self-taught, and unapologetically solo, she turned the Adirondacks into both her home and her proving ground. Through her four-volume autobiographical series, “Woodswoman” and beyond, she showed generations of women that the outdoors isn’t something to visit — it’s something you can belong to.
Our Bastille Trail Pant carries that same spirit: self-reliant, no-frills, and ready for wherever you decide to explore.