The Gen 4 S1 Pro Knee Pad is thoughtfully designed with comfort, durability, stability and function in mind. We took great care in the design and development of this product and are very excited to bring our vision to reality. Years in development and thousands of hours of wear testing we are very proud to introduce the Gen 4 S1 Pro Knee Pad.  The Gen 4 Pro Knee pad is exactly the same in design, function and size as the Gen 3 knee pad with the only changes being stitching reinforcements at each of the strap contact points and a new layer of shock reducing foam added to the inner knee cup.


• Streamlined Pad Design 

• Military Grade Ballistic Nylon for durability

• Impact Absorbing Knee Cup with memory foam for form fitting comfort, shock absorption and stability on impact

• Triple Stitch construction for extra strength

• Articulated Butterfly Back Flaps for secure fit to prevent slipping and increased mobility

• High Abrasion Replaceable PC Knee Cap with ultra flat surface for stability.

• Perfect Length locking adjustment top straps


  • Ships directly through S1 USA.


    We can ship to most address's in the world. When you place an order in the US there will be a flat rate of $8.00 per item for most items and lower for other items.  Shipping is more expensive than this but we do this as a courtesy to our customers.  Shipping will either go Fed Ex Ground or USPS First Class Mail unless express options are selected  If you have questions about shipping please Email FedEx Express Saver, 2 day, and Overnight shipments submitted before 3pm PST will ship same day.

    We also provide discounted shipping rates to our International customers as well.  If you place an order and want it shipped Internationally depending on the Country you are in the site will charge you a $25.00 - $45.00 flat rate surcharge.  All International Orders will be shipped out Fed Ex Express or USPS Priority Mail. Each country has its own policy on how much they charge for duties and taxes for imported purchases so also be prepared to pay an additional amount when the package arrives.  

    Returns Policy
    RETURNS : You can return a product within 60 days as long as it has not been used. Just email and let us know what the problem is or why you would like to return the product. If it is a sizing issue for a helmet and you have already tried all of the other sizing liners in the box we may be able to simply send you the correct sizing liner and save you some money on shipping the helmet back to us. Make sure to ask for an RA#. We will email you back with an RA# and then you just send the helmet to the address below. (you pay for shipping and we suggest you get a tracking # so you can track the package). When we receive the helmet we will refund you the amount of the original purchase.  

    WARRANTY : All products are warranted for 90 days from the date of purchase to be free of manufacturer's defects. This only applies to the original owner and must be accompanied by a sales receipt as proof of purchase. This warranty does not apply to damage resulting from impact, misuse, abuse, accident, negligence or normal wear and tear. If you feel your helmet has a manufacturer defect you should email with pictures and an explanation of what is wrong. We will reply to your email with a WA#. When you have the WA# send the helmet to the address below. If the helmet has a manufacturer defect we will send you a new helmet. If the helmet does not have a manufacturer defect you will need to pay for shipping for us to return the helmet to you. 


    Send To:

    S1 Helmet Company

    Attn: Returns RA # _______

    13210 Estrella Ave Suite A

    Gardena, CA 90248