One K Defender Helmet

From $229.95

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Product Summary:

One K Defender Helmet

One K™ Helmets boast the perfect synergy between advanced technology and aesthetically pleasing design. With enough features to appeal to those seeking everything a helmet could possibly offer, wrapped in a package that traditionalists can appreciate, One K™ has the best of both worlds.


  • Advanced ABS composite outer shell
  • Injection molded shell design
  • Washable, quick-dry, moisture wicking and anti-microbial liner
  • Stainless steel mesh
  • Comfort padded harness with synthetic suede lining
  • Hook and loop adjustment
  • Fastex buckle
  • Two side, two front, one back, and two center stripe vents
  • Available in Glossy and Matte
  • Certified to ASTM and CE EN standards
Style Item Number Model Number UPC
Large Black Gloss Matte E017648 LG BGM 468259BKGLMLRG 841095031063
Large Black Glossy E017648 LG BLKG 468259BKGLSLRG 841095537114
Large Black Matte E017648 LG BLKM 468259BKMATLRG 841095549384
Large Brown Matte E017648 LG BRNM 468259BNMATLRG 841095703014
Large Navy Matte E017648 LG NVYM 468259NYMATLRG 841095703021
Large Long Oval Black Matte E017648 LLO BLKM 468259BKMATLRGL 841095644591
Large Long Oval Brown Matte E017648 LLO BRNM 468259BNMATLRGL 841095703038
Large Long Oval Navy Matte E017648 LLO NVYM 468259NYMATLRGL 841095703045
Medium Black Gloss Matte E017648 MD BGM 468259BKGLMMED 841095031070
Medium Black Glossy E017648 MD BLKG 468259BKGLSMED 841095537121
Medium Black Matte E017648 MD BLKM 468259BKMATMED 841095549391
Medium Brown Matte E017648 MD BRNM 468259BNMATMED 841095703052
Medium Navy Matte E017648 MD NVYM 468259NYMATMED 841095703069
Medium Long Oval Black Matte E017648 MLO BLKM 468259BKMATMEDL 841095612651
Medium Long Oval Brown Matte E017648 MLO BRNM 468259BNMATMEDL 841095703076
Medium Long Oval Navy Matte E017648 MLO NVYM 468259NYMATMEDL 841095703083
Small Long Oval Black Matte E017648 SLO BLKM 468259BKMATSMLL 841095612668
Small Long Oval Brown Matte E017648 SLO BRNM 468259BNMATSMLL 841095703113
Small Long Oval Navy Matte E017648 SLO NVYM 468259NYMATSMLL 841095703120
Small Black Gloss Matte E017648 SM BGM 468259BKGLMSML 841095031087
Small Black Matte E017648 SM BLKM 468259BKMATSML 841095549407
Small Brown Matte E017648 SM BRNM 468259BNMATSML 841095703090
Small Navy Matte E017648 SM NVYM 468259NYMATSML 841095703106
X-Large Black Gloss Matte E017648 XL BGM 468259BKGLMXL 841095031094
X-Large Black Matte E017648 XL BLKM 468259BKMATXL 841095549414
X-Large Brown Matte E017648 XL BRNM 468259BNMATXL 841095703137
X-Large Navy Matte E017648 XL NVYM 468259NYMATXL 841095703144
XL Long Oval Black Matte E017648 XLLO BLKM 468259BKMATXLGL 841095644607
XL Long Oval Brown Matte E017648 XLLO BRNM 468259BNMATXLGL 841095703151
XL Long Oval Navy Matte E017648 XLLO NVYM 468259NYMATXLGL 841095703168
X-Small Black Matte E017648 XS BLKM 468259BKMATXS 841095074329

Product Reviews by Customers

4.9 / 5.0
16 Reviews
5 Stars
4 Stars
3 Stars
2 Stars
1 Star
My daughter Loved It!!!
September 18, 2018
3 weeks ago
Would buy another
Has good airflow so my hair isn’t soaking wet when I finish riding and I love the way it fits.
September 10, 2018
1 month ago
One K is an amazing helmet!
This is my second One K Defender helmet! The first one received a swift kick to the top of my head and, let me tell you...I felt the entire hoof, but this helmet saved my life!! It suffered minor damage and to look at it, you would never know! It held up beyond my wildest expectations! I ride many young horses and will never mount without this helmet!!
August 27, 2018
1 month ago
Love it!
Love it! Fits well and is very comfortable.
July 15, 2018
4 months ago
Love my One K
I love my new helmet... get so many complements on the navy blue
June 26, 2018
3 months ago
Love this helmet
June 12, 2018
3 months ago
Attractive helmet with wonderful aeration
Not only well fitting and attractive, but cooler than my usual helmet in the Texas summer.
January 29, 2018
11 months ago
Great quality, fit, and lightweight
I bought this helmet because of its ventilation features, and the ability to remove the liner for cleaning. I'd had a good helmet previously, with no ventilation, and no removable liner, so did not like my issues with heat and cleaning the helmet. I've been pleased with the One K Defender helmet's performance, great fit, and its lighter weight. Would definitely recommend this One K brand and product.
April 10, 2017
Best helmet I've ever owned!
I'm so in love with my matte defender! I love the profile, it's flattering to all and with a shape for round and oval heads, you can't go wrong. This is a stellar price for a top of the line, super safe, and classy helmet. A color to go with anything, and a style to go with any discipline. I wear my matte defender for schooling and I love it so much that I bought a suede defender with bling for shows!! Best of all, it's comfortable and safe, and affordable at just over $200.
April 2, 2017
Great for everyday
I like the fit of these. The only downside is with a lot of hair, the large is a bit tight. But I absolutely love the navy. I also own a black. Love one k.
January 31, 2017
Start typing your question and we'll check if it was already asked and answered. Learn More
Browse 3 questions Browse 3 questions and 7 answers
Why did you choose this? Store
affordable and sleek!
Hayley B on Jan 6, 2018
Suzanne T on Feb 18, 2017
affordable and sleek!
Hayley B on Jan 6, 2018
This is the most comfortable helmet you can order and it has a removable liner that you can wash!
Sarah H on Aug 2, 2017
Suzanne T on Feb 18, 2017
recommended by many riders in horse community
Daughter had needed a new helmet
Noelle C on Nov 21, 2016
This is the most comfortable helmet you can order and it has a removable liner that you can wash!
Sarah H on Aug 2, 2017
recommended by many riders in horse community
Daughter had needed a new helmet
Noelle C on Nov 21, 2016
What's long oval?
A shopper on Dec 31, 2016
BEST ANSWER: Many of the helmets today only offer 1 style of helmet shape and that is round, though they don't say "round". For those with a more oval shaped head, One K offers a Long Oval option. This was a blessing for me since I had not been able to find an ASTM helmet that didn't put pressure on the center of my forehead. I don't know why they call it Long Oval when it's really just more oval in shape than the rest. Hope this helps
How do I determine what size to buy? I do not see a size chart anywhere on the description.
Donna S on May 31, 2018

I have attached items size chart, please measure around the head above the eyebrows. That measurement will match the one on the size chart.