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One K (#21806)

One K Defender Suede Helmet

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(You save 5% as a member of . Because you have supplements on AutoShip, you can save an extra 10% on this and all other SmartPak tack & apparel items! Enter promo code PERKS at checkout.)
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As riders and online shoppers, we know it can be tough to buy a new bridle or pair of boots without trying them on. That's why we moved the fitting room to your living room (or barn)! From breeches to blankets, if you or your horse can try it on, you can return it, free! Just request a return with a FREE SmartPak return label from your Order History within 60 days of the purchase date. And of course, please make sure the item is in like-new condition with original packaging (we said 'fitting room', not 'war room'!).

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FINAL SALE - This item cannot be returned or exchanged.

FINAL SALE - This item cannot be returned or exchanged.

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You'll love our AutoShip because it's:
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PLUS! You'll save % on every shipment if you order this product on AutoShip
You'll love our AutoShip because it's:
  • Focused on healthy s, because consistency is key
  • Easy to snooze or cancel online, anytime
  • Totally flexible - edit your order as often as you'd like
  • Your VIP pass to FREE SmartPerks benefits
PLUS! You'll save % on every shipment if you order this product on AutoShip
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Zone Map
Begin with the zone for the state you are in. Dates shown on the map indicate suggested start and end dates for Fly Stoppers™ shipments. You may want to shift a zone if your elevation or microclimate is unusual, or if you fall on the border between two zones. You can start anytime during the fly season. Choose "Year Round" for climates that have flies all year, and start now.
Program Type Shipment/Application Frequency
Regular Programs: Ships every 4 weeks. For low to average fly levels, frequent manure management and few neighbors.
Premium Programs: Ships every 3 weeks. For high fly levels or weekly manure management or nearby livestock.
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Before purchasing this item, please note:

  1. This item can't be shipped to a PO Box.
  2. This product will be shipped directly from the manufacturer using a shipping company.
  3. The freight company will call you to schedule a delivery appointment.
  4. If SmartPak and the shipper are unable to contact you within 7 business days of the product shipping out, your order will be cancelled.
  5. You may be liable for any storage fees due to missed delivery appointments or requests for dates beyond the standard delivery window.
  6. When your shipment arrives, you will be responsible for inspecting the shipment to make sure it's complete and that no items are damaged.
  7. Before accepting the shipment and signing for it, you must record missing items and damaged items on the receipt, and take pictures of any damage.
  8. SmartPak and the manufacturer will not be able to assist you in filing a claim if you haven't noted any damage on the receipt. You will be responsible for filing any claims.

Shipping is not available to Alaska or Hawaii for this item. We apologize for any inconvenience.
Unfortunately, we cannot guarantee that customization items will be delivered by Christmas. If you're adding customization to this item, please note the estimated arrival date in your cart.
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All customized items are personalized in our Plymouth, MA facility, and it looks like this item is currently out of stock in that location.
Please call 1-800-461-8898 to order this product.
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We're bringing you this product at the lowest price allowed by the manufacturer so you won't find it cheaper anywhere else. This also means we can't apply any further discounts or promotions.
We're sorry this item is currently out of stock. Our team is working to get it back in stock asap.

SmartPerks Putting your horse's supplements on AutoShip helps you take great care of your horse, so we take great care of you with SmartPerks! When you order your horse's supplements on AutoShip, you're automatically* eligible for our FREE SmartPerks benefits, including:

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*At least one individual AutoShip supplement or horse's SmartPaks must be over $40. Some exclusions apply. Visit or call 1-800-461-8898 for details.


Why We Love This

The One K Defender Suede Helmet is perfect for schooling or the show ring! Plus it’s vented and lightweight to keep you cool and comfortable, even under pressure. Features two side, two front, one back, and two center stripe vents that keep you looking good and staying cool in any weather. 

Additional One K Helmet Liners also available! 


CAUTION: Safety equipment must fit properly and be appropriately secured with manufacture approved parts only. Altering or adding to safety equipment voids warranty and can result in injury. As a safety precaution, inspect all products prior to each use.

For additional information on fit, watch our video on how to fit your helmet. Click Here!

Check out the other items we offer from One K helmets Here!


  • Polycarbonate and Advanced ABS Composite outer shell with an injection molded shell design
  • Inner lining is anti-microbial, moisture wicking, quick drying, and washable
  • Comfort padded harness with synthetic suede lining and Fastex buckle
  • Chamude® synthetic suede covered
  • ASTM/SEI F1163-15 certified
Key Specifications
  • ASTM/SEI: Yes
  • Oval: Yes
  • Round : Yes
(Maintenance Dose = )
Ingredient Amount
What Customers Say:
Sizing Chart for One K Defender Suede Helmet
Oval Yes
Round Yes
One K Defender Suede Helmet is rated 4.8 out of 5 by 95.
Rated 5 out of 5 by from Excellent fit Finally a helmet that fits my head. I've been through 4 brands with oval shapes and they were all to tight in a medium even though I've always worn a 7. The removeable liner isn't so thick that it squeezes you temples. I'm not sure why people think this runs small, the IRH medium was way tight on me than this helmet. I will only buying this brand going forward.
Date published: 2022-08-25
Rated 5 out of 5 by from Wonderful helmet I love my helmet. I have had a version of this for a few years. It is well ventilated and the lining is removable.
Date published: 2022-05-24
Rated 5 out of 5 by from I don't look like I have a stadium on my head Overall very happy with this helmet. A friend of mine bought a round one prior to the oval being available and she didn't care for the round fit then but loves the way the oval fits now. I'm a petite person with a pretty average size head so it's hard to find hats that don't look huge on me which is why I've gone with GPA for years. I decided to try something different/cheaper now that I'm not showing and solely fox hunting and have an exercise helmet(hack in one, hunt in another). I couldn't justify spending GPA prices when most helmets have caught up in safety technology standards. It reminds me of the fit of a Charles Owen velvet, snug and comfortable and no headaches. I'm happy! Hopefully it breathes well, like my GPA but we're going into the cool season so I won't know until next year.
Date published: 2021-11-19
Rated 4 out of 5 by from Difficult Fit, Good Airflow I had a hard time finding a good fit in this helmet, and had to order/return/re-order several times before I found the right one. First, these helmets run small compared to Charles Owen and IRH. My measurements did not match up with the size chart, which said I should get a M, but I actually needed a L. I'd also read that most people have oval-shaped heads, but again, after quite a bit of trial and error, I found the round fit me best. Be prepared to try a few size/shape combinations. If you're dead set on ordering from Smartpak, see if you can try this helmet on in a local store first. Smartpak's customer service is always great, but it's still a hassle to order/return/re-order multiple times. That said, I do like this helmet for the most part. I haven't had it long, but you can literally feel a breeze through the vents when you're riding and even just walking. I'm VERY heat sensitive, so this is a huge plus for me during the summer. It also has an attractive, modern look that's very nice. The biggest drawback is that the chin strap is wide and set at a strange angle. At first, it really bothered me because it felt like it would come up over my chin, but it hasn't and I got used to it. Obviously this will be different for different people, but it's something to think about when you're trying these on. I also think the chin strap is a bit cheap and the placement of the velcro may not work for everyone. I know this is a poor man's Samshield, but for the price, I'd still expect a nicer, more adjustable strap. Again, overall a nice helmet, good air flow, runs small, weirdly fitting chin strap.
Date published: 2021-06-15
Rated 5 out of 5 by from Comfortable I have a hard time finding helmets that fit properly, and wanted one with a removable liner that can be washed or replaced. This was exactly what I was looking for.
Date published: 2020-09-29
Rated 5 out of 5 by from Flattering helmet I have a rather large head and this does not make my head look huge. It also is comfortable.
Date published: 2019-11-27
Rated 3 out of 5 by from Problematic chinstrap I really liked the looks of this helmet thanks to the microsuede cover, but I had to return it due to fit issues. The liner of the helmet is well-cushioned and comfortable, and it fit my head well, but the angle of the chinstrap goes too far forward. It was practically on the front of my chin versus under my jaw, so it really wouldn't secure the helmet in a crash. I could imagine the force of hitting the ground would push the chinstrap too far forward and result in the helmet popping right off.
Date published: 2019-08-14
Rated 4 out of 5 by from Good helmet I got this helmet in 2017 when I switched from braids to having my hair in my helmet for shows, and it's still like new! I've taken a few spills in it and it holds up very well. My only complaint is that it tends to stab my forehead when I wear it and it always leaves me with a giant bump there, but I think that's probably just a sizing issue. Overall it's a good helmet for a good price.
Date published: 2019-05-12
Rated 5 out of 5 by from Good looking helmet The helmet fits well and is comfortable. The chin strap is easily adjustable.
Date published: 2018-09-12
Rated 5 out of 5 by from Best Investment First "pricey" helmet I've bought and I am 100% in love! Went with the long oval and it fits like a glove! So comfortable. I have yet to ride in the middle of the summer heat but so far so good.
Date published: 2018-05-19
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Q & A
One K Defender Suede Helmet Review
Kerri from SmartPak talks about why she thinks the One K Defender Suede Helmet ( is so smart. The smartest reason to get yours at SmartPak? Free Shipping Both Ways! At, you'll get free shipping every day on all orders over $75 and free returns on all sized items. Just another way it pays to be $mart.
How to Shop for a Helmet
Have you ever struggled with the idea of buying a helmet online? Watch this video for tips & tricks on getting the right helmet fit.

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