The STG Difference Free Domestic Shipping For Orders Over $99 Hassle Free Returns No Restocking Fees Price Match Guarantee Customer Rewards, Earn STG Cash

KNOX Advance X Elbow/Knee Protector Insert Part 31

Click to see 1 more pictures
$19.95 $9.95
(You save $10.00)

Customer Service

  • 888.784.4327
  • Monday-Friday
  • 10am to 6pm EST
  • Saturday
  • Closed
  • Free Domestic Shipping for Orders over $99Any domestic order (lower 48 United States) over $99.00 ships for free! If your item isn't over $99 but your total cart value is, you'll qualify for free shipping as well! For more information on our Shipping Policies, click here.
  • Hassle Free Returns No Restocking FeesHere at STG we want any return or exchange to be quick and pain-free. You can contact anyone here to expedite your return or exchange and we'll make sure it's handled ASAP. For more information on our policies, click here.
  • Price Match GuaranteeFind a better price? If you have we will match it! Call us at 888.784.4327 or submit a request here and our team will make it happen. *Some exclusions may apply.

Frequently Bought Together

Please choose Options for all selected Products

  • Choose Options


  • Knox Inside is designed to replace uncomfortable or crash damaged armor.
  • Suitable for use as an Elbow or Knee protector.
  • Knox Advance X Impact Protectors are made from a 3 layer construction with a unique polypropylene honeycomb inner core that is covered in soft PE foam. The protectors are engineered to form a flexible and comfortable protector.
  • At only 30g per piece they are the lightest in the collection which is a significant advantage. The honeycomb section works in synergy with the outer foams to offer superb protection.
  • When tested against the European standard EN1621/1-97 the transmitted force is an excellent 23kN. This is 35% better than the maximum force allowed.


  • Part 31: Will fit into a garment pocket measuring approximately 15cm wide x 25cm in length
  • Part 33: Will fit into a garment pocket measuring approximately 17cm wide x 29cm in length