Fall Sale
Shop up to 40% off
EXTRA 20% Off Clearance
Shop now | Ends 10/26
Spend $200, Get $30 Cash Back
Summit+ only | Shop kids'
Race Ultra PFI 50 Sock
Size:
Quantity
Join Summit Club+ and
Race Ultra PFI 50 Sock delivers race-level precision with a thin, high-performance design
What Our Gearhead® Experts Are Saying:
"I like these when I want the thinnest possible sock inside my boots. They keep the fit feeling really precise while still staying comfortable through long days."
For skiers who prioritize precision above all else, a thin sock can make the difference between a good boot fit and a perfect one. The Race Ultra PFI 50 Sock is designed to deliver a minimalist feel with race-inspired performance.
Its ultra-thin construction minimizes bulk inside the boot, allowing for a closer connection between foot and shell. Light compression rated at 10–15 mmHg helps support circulation while maintaining a secure, stable fit during high-output ski days.
Copper-infused fibers provide anti-odor properties to help keep the sock feeling fresh through repeated use. Reinforced toe and heel areas add durability in high-wear zones without compromising the lightweight design.
Built for skiers who value precision, responsiveness, and minimal bulk, the Race Ultra PFI 50 Sock delivers streamlined performance for demanding days in ski boots.
Details
- Thin racing design enhances precision boot fit
- Light compression (10–15 mmHg) supports circulation and stability
- Reinforced toe and heel improve durability in high-wear areas
- Minimal bulk construction maintains close foot-to-boot connection
- Lightweight materials promote breathability and comfort
- Designed for performance ski boots and aggressive skiing
- Item #BTD001M
- Material
- 59% nylon, 36% polypropylene, 3% copper, 2% elastane
- Height
- over-the-calf
- Weight
- lightweight
- Cushion
- light
- Activity
- ski, snowboard
Your Specialist For Customized Athletic Footwear
BOOTDOC strives to be a part of your athlete's journey by supporting your feet and developing the tools for you to improve their performance.
This thin pro performance power fit sock is built for ski racing and hard touring days, pairing low-volume race boots with a snug, gradual 10-15 mmHg compression that stabilizes the lower leg without trapping bulk. A lightweight knit of polyamide (59%), polypropylene (36%), copper (3%) and spandex (2%) balances quick-drying warmth and stretch, while the copper thread suppresses odor on cold race mornings and multi-day rotations. The low-profile construction slips under thin liners and race shells for a precise fit and efficient heat management that complements technical outerwear and performance layers. Ideal for cold race starts and long transitions.
On spring skin-ups and backcountry skiing missions the thin, breathable layering works under touring liners to reduce friction and maintain circulation during long climbs, and it serves well in fast-paced alpine approaches where a low-volume footbox matters. The sock suits racers, light-and-fast backcountry skiers, and athletes who favor minimal insulation with targeted support. Its slim fit also translates to approach shoes and minimalist hikers who need compression and odor control without bulk, making it a versatile piece for camping, climbing, and multi-sport ventures that demand comfort and precision. Durable enough for repeated season use.
Related Categories
Frequently Asked Questions
How does the BootDoc Race Ultra PFI 50 Sock’s compression change how the sock fits inside race boots?
The Race Ultra’s PFI 50 soft, gradual compression (10–15 mmHg) gives a snug, low-volume fit that reduces fabric bunching in close-fitting race or performance ski boots; choose the foot-length-matched size rather than sizing up to avoid pressure points.Is the BootDoc Race Ultra PFI 50 Sock designed for alpine race and performance boots?
Yes — the Race Ultra is a thin racing sock listed as a “Pro Performance Power Fit sock” and is specifically “designed for low-volume applications,” making it well suited to alpine race and tight-fit performance boots; it’s also listed with an over-the-calf height.How effective is the Race Ultra PFI 50 Sock at odor control and what is it made from?
The sock uses copper-containing yarn for antimicrobial/anti-odor properties and the material breakdown is 59 % polyamide, 36 % polypropylene, 3 % copper, 2 % spandex, delivering lightweight, odor-resistant performance in a thin racing profile.Which BootDoc size should I pick for the Race Ultra PFI 50 Sock?
Use the unisex chart and match foot length: for example, M = EU 39–41 / US 7–8 or L = EU 42–43 / US 9–10; the listing is unisex, so choose the EU/US size that matches your foot and avoid sizing up to prevent excess material in a race boot.Can I use the Race Ultra PFI 50 Sock for hiking, climbing, or running?
It can be used for short, fast outings where a thin, snug sock is preferred, but it’s optimized for skiing/all-mountain use (Recommended Use: All-Mountain Skiing; All-Mountain Snowboarding) and has a light cushion, so it’s not intended as a cushioned hiking or insulated multi-day sock.