You're going to LOVE the fit. Try it on and experience our perfect fit. If you don't love it, send it back in new and unused condition within 30 days for an exchange or full refund*. Risk free.
Free US Shipping
We offer Free Shipping on all orders over $99 within the US. During select promotions & holidays we will offer Free Shipping on all orders within the US.
1–3 Year Warranty*
We stand behind our products – with a 3 year warranty against materials and workmanship for all boots & 1 year warranty on socks.
100% Secure Checkout
At 509 we use the best SSL certificate and the most trusted payment processors provided by Shopify Payments.
Whether on the trail or track, ride confidently while keeping your knees protected and comfortable with the 509 Race5 Knee Brace Socks. These tall socks have been designed to wear under knee braces to reduce abrasion and chaffing. Made with a lightweight, stay-in-place Powerstretch upper thigh with a silicone gripper for ultimate stretch, paired with a lower a knitted, breathable sock.
Key Features
- Fits half size smaller
- Available in multiple sizes for optimal fit
- Tall sock to wear under knee braces
- Reduces abrasion and chaffing
- Knitted lower sock for comfort and breathability
- Lightweight powerstretch knit upper
- Silicone gripper keeps sock in place
- WARNING for California Residents
Read More
Size Guide
Not sure about your size? Try on at your local dealer!
Footwear is shown in male foot sizing, see chart below for approximate female equivalent. If you are a half size, size down and add a thicker insole to boot.
Snow & Dirt Boots
| Men's | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 |
| Women's | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 |
Socks (non-ignite)
| Men's | Sizes 5 – 8 = SM/MD | Sizes 9 – 13 = LG/XL |
| Women's | Sizes 6 – 9 = SM/MD | Sizes 10 – 14 = LG/XL |
Ignite Socks
| Men's | Sizes 9 - 11.5 = MD | Sizes 12 - 15 = LG |
