SKU: 37840510303

Alpinestars - SX-1 Plasma Knee Protector

Sale price$116.95 Regular price$129.95
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Ships within 48 hours · Estimated delivery Jul 15 - Jul 20

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Description

Alpinestars - SX-1 Plasma Knee ProtectorAlpinestars SX 1 Plasma Knee Protector The SX 1 Plasma Knee Protector are built to keep your knees and shins protected from hits, roost, and stray footpegs. The SX 1 PLASMA Knee Protector features a PLASMA Knee Protector embedded into a highly ventilated semi rigid frame construction for superior impact protection, while the integrated Dual Gear System (DGS) promotes the natural articulation of the knee. Key Features: Highly Comfortable: The Nucleon

Alpinestars - SX-1 Plasma Knee Protector

The SX-1 Plasma Knee Protector are built to keep your knees and shins protected from hits, roost, and stray footpegs.

The SX-1 PLASMA Knee Protector features a PLASMA Knee Protector embedded into a highly ventilated semi-rigid frame construction for superior impact protection, while the integrated Dual Gear System (DGS) promotes the natural articulation of the knee. Key Features: Highly Comfortable: The Nucleon PLASMA knee protector is constructed from a USDA Certified Biobased viscoelastic material.

Why We Like It

We like how they manage to cover so much area without feeling like heavy, awkward armor.

Why It’ll Work for You

If your shins have already met pegs and rocks, adding this kind of protection is a smart move for future rides.

Variants / Options

Available in multiple sizes and sometimes youth versions to match different riders.

Key Features

  • Highly Comfortable: The Nucleon PLASMA knee protector is constructed from a USDA Certified Biobased viscoelastic material. Designed for multi-directional pliability, the protector molds to the knee for a close fit, effectively dissipating impact energy to deliver reliable protection.
  • Dual Density Co-Injected Frame for Support and Unrivalled Comfort: Engineered with a scooped lower extension made from a soft polymeric blend to avoid any pressure points associated with a hard edge from occurring as a result of the boot pushing against the protector. The same scooped design is also applied to the upper extension, preventing the protector from digging into the skin and causing discomfort while riding.
  • Controlled Natural Movement: Featuring the Dual Gear System (DGS) where both the upper and lower frames have integrated gear profiles that ensure a smooth hinge function to promote the natural articulation of the knee.
  • Ergonomic Frames with Versatile Sizing: The ergonomically sculpted frames of the SX-1 PLASMA Knee Protector feature strategically positioned rigid and flexible over-injected shells, providing a secure yet adaptive fit for a wide range of leg sizes.
  • Patella System Protection: The Patella System is engineered to offer full coverage of the knee cup regardless of the degree of extension while the rigid outer Patella System shell prevents injuries from handlebar strikes.
  • Lightweight knee protection with extensive protective coverage.
  • Upper and lower frames are constructed from a high-performance polymer for optimized levels of flexibility and strength as well as excellent weight-saving properties.
  • The upper and lower frames' integrated dual pivot hinge system follows the natural movement of the knee and keeps the protector well positioned while riding.
  • Frames feature a slim ergonomic design.
  • The dual strap closure system features a hook-and-loop closure with snap-fit buckles for easy in and out and a personalized, secure fit.
  • According to European statutory law, the CE mark is a conformity requirement for the marketing of this product. The following standards apply: Knee protector: EN 1621-1:2012 LEVEL 1

Shipping Notes
  • Free Standard Shipping on $100+ Orders to the USA.
  • Except Preorder products are shipped in 48 hours.
  • Delivery to the USA:
  1. Standard Shipping : 3-10 business days
  • If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
  • We offer a 30-day return/exchange service after receiving.
  • Final sale items are not eligible for returns or exchanges.
  • To process your return/exchange, please contact us at [email protected]
  • Please click here for more details>>> Return & Exchange Policy
SKU: 37840510303

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4.2 ★★★★★
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Laura
Bozeman, US
★★★★★ 5
Stylist and comfortable!!!
Size: 6, Color: Red Pepper
So comfortable and well made. I’m going to get these in multiple colors.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on June 11, 2026
A
Verified Purchase
Ally
Boise, US
★★★★★ 2
Not sturdy enough for me
Size: 8, Color: Chestnut
Really cute and well made but not sturdy. I rolled my heel within minutes of walking around the house. Ain’t nobody got time for that
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Reviewed in the United States on May 6, 2026
B
Verified Purchase
Bonnie
Massapequa, US
★★★★★ 5
Oh so stylish Uggs
Size: 8, Color: Dense Smoke
They are so comfortable and stylish. I’m a size 8.5 and went with a size 8. Great value! Go get some I also got them in a tan color. Love them!
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Reviewed in the United States on May 18, 2026
S
Verified Purchase
Sierra Schafer
Dallas, US
★★★★★ 5
Very Comfortable
Size: 9, Color: Chestnut, Size: 9, Color: Chestnut
Good quality and very comfortable. Sizing is accurate.
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Reviewed in the United States on April 8, 2026
C
Verified Purchase
CrisJoy
Phoenix, US
★★★★★ 4
Cute - change footbed please
Size: 8.5, Color: Dense Smoke
These are so comfy and fit my usually 8.5 foot great. It's the footbed of UGGs that I keep hoping they'll change. It's like our memory foam mattress - cushy and great UNTIL THE HEAT comes! Then it's a no for this hot 65 yo G'ma!
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Reviewed in the United States on May 20, 2026

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