Skip to content
PLEASE NOTE: You may experience errors on our site when using Internet Explorer 10 or lower. Please consider updating your browser, or download Google Chrome.
Ship speed applies to in stock items, pending location. Does not include personalized items like engraving, embroidery, SmartPaks, or PortionPaks. Complete details on our Shipping Policies page.
All of our supplement and product expertise is just a text away. Ask questions, manage your account, and place orders by texting 26756 from your mobile phone. Have a great ride!

Our experts are available
Monday – Thursday 9:00 am – 5:00 pm EST
Friday 9:00 am – 3:00 pm EST

*By texting 26756, you're giving SmartPak your consent to text you to help resolve your issue, including automated replies, at the number you provided. To opt out, text STOP to 26756. Text HELP to 26756 for info. Msg&rates may apply. Consent to receive texts not required to buy products. Terms & conditions and the full Text Message Privacy Policy can be found at https://www.smartpakequine.com/content/2waytextTC in case you're interested.
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:
Learn more about SmartPerks
*At least one individual AutoShip supplement or horse's SmartPaks must be over $40. Some exclusions apply.
Visit SmartPak.com/SmartPerks or call 1-800-461-8898 for details.

Qualifying Items

Qualifying items are eligible for free shipping, every day. Look for the badge below on the product page to confirm that your item ships free!
SmartPerks
Free Shipping

Ride Along Items

Ride Along items are eligible for free shipping when shipped with your next AutoShip order or any qualifying item. Look for the badge below to identify a Ride Along item.
Ride Along Item
Ships free with a qualifying item
Clicking on the following image links will update the image above.
Clicking on the following image links will update the image above.
colors available

One K Defender MIPS Matte Helmet

One K - Item #32770
Our Price: List Price:
Our Price: Our Price: Sale Price: : $ (%) :
Member Price:
(Members save 5% at SmartPak)
:
SmartPerks Price:
(Because you have supplements on AutoShip, you save an extra 10% on this and all other SmartPak tack & apparel items!)
Your Price:
(You save 5% as a member of . And, because you have supplements on AutoShip, you save an extra 10% on this and all other SmartPak tack & apparel items!)
SmartPerks Price:
(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.)
Your Price:
(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.)
SmartPerks
Free Shipping (Details)
(Details)
Ships free with a qualifying item
Free Return Shipping
Free Return Shipping

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'!).

Customize your program:
Selecting any options will update the details accordingly with respect to the product

FINAL SALE - This item cannot be returned or exchanged.

FINAL SALE - This item cannot be returned or exchanged.

- +
Just left - order today! Don't wait - just a few left!
on every AutoShip order (Details)

days
(Discounted price will be reflected in your cart)
You'll love our AutoShip because it's:
  • Focused on happy riders - never worry about running out!
  • Easy to snooze or cancel online, anytime
  • Totally flexible - edit your order as often as you'd like
PLUS! You'll save % on every shipment if you order this product on AutoShip
(Details)
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
Price for one-time shipment:
Find zone
How to choose
AutoShip price: Price per shipment:
AutoShip Savings applied
Start date: Customize your program for estimated start date. View estimated schedule
:
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
Regular Programs:
Premium Programs:
Shipment/Application Frequency
Ships every 4 weeks. For low to average fly levels, frequent manure management and few neighbors.
Ships every 3 weeks. For high fly levels or weekly manure management or nearby livestock.
Required: (Optional)
These are for:
Sign in to choose an existing
Order within and have it by
Shipping to
Est. arrival times vary,
with some as soon as
Shipping to
Order within and have it by
Shipping to
Add these items to your cart to get your estimated arrival date.
Shipping to
Please call 1-800-461-8898 to order this product.
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, but certain colors/sizes are sold out and are no longer available.

Why We Love This

The ever popular One K Defender now with MIPS technology.  Founded in 1996 by a neurosurgeon and a researcher from the Royal Institute of Technology in Sweden, MIPS stands for Multi-directional Impact Protection System and is designed to add protection against rotational motion transmitted to the brain from angled impacts to the head.  MIPS added protection has been independently proven to reduce rotational motion by redirecting forces that would otherwise be transmitted to the brain. One K MIPS helmet features black matte Polycarbonate and Advanced ABS Composite outer shell; injection molded shell design; washable quick-dry, moisture wicking, anti-microbial liner;  and comfort padded harness with synthetic suede lining, hook & loop adjustment, and Fastex buckle; two front, one back, and two center stripe vents. For best care, wipe down with a clean, damp cloth for dust or dirt;machine wash removable inner liner.


Imported.

Helmets Comparison Chart

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

Favorite Features

  • One K Defender now with MIPS technology
  • Founded in 1996 by a neurosurgeon and a researcher from the Royal Institute of Technology in Sweden
  • MIPS stands for Multi-directional Impact Protection System and is designed to add protection against rotational motion transmitted to the brain from angled impacts to the head
  • MIPS added protection has been independently proven to reduce rotational motion by redirecting forces that would otherwise be transmitted to the brain.
  • One K MIPS helmet features black matte Polycarbonate and Advanced ABS Composite outer shell
  • Injection molded shell design
  • Washable quick-dry, moisture wicking, anti-microbial liner
  • Comfort padded harness with synthetic suede lining, hook & loop adjustment, and Fastex buckle
  • Two front, one back, and two center stripe vents
  • ASTM and CE EN certified
(based on )
of customers would recommend this product to a friend!
Tell us what you think!

The reviews provided on this website represent the experience of the individual posting the review. We do not adopt, edit, or endorse any of the submissions posted within the reviews section. Rather, the reviews are part of an online community of animal owners that desire to share their particular experience with other individuals. These reviews are not a substitute for discussing the health of your animal with a veterinarian.

SmartPak customers are some of the most conscientious animal owners around. We encourage you to share your experience with the products we sell to help fellow customers to make informed choices for their animals. We do not edit these reviews in any way - they are direct customer-to-customer communication. We do monitor reviews for positive and negative feedback, and use this feedback to improve our selection as well as sharing feedback with product manufacturers to help them improve their products. Please note that we recommend consulting your vet with serious health issues.

  • Review 0
  • Votes 0
  • Discipline:
  • Expertise:
  • Product
    Experience:
  • Competitor:
Quality
Value
Palatability

Helpful?

Ingredients

(Maintenance Dose = )
Ingredient Per Serving Per Pound

Sizing

XS-XL, Regular and Long Oval
What Customers Say:
sizing chart

You Might Like

    Reviews

    One K Defender MIPS Matte Helmet is rated 4.5 out of 5 by 4.
    Rated 4 out of 5 by from Not for me but give it a try One of three (Charles Owen & Trauma Void were the other two) I tried. I’ve had two Charles Owen Wellington (velvet 6 7/8) helmets over the last 5 years and wanted the new MiPS technology and good ventilation. This One K in oval shape was too loose, but if I still had my long thick hair it probably would have been perfect!
    Date published: 2020-10-21
    Rated 5 out of 5 by from Fits Well Got this helmet for my daughter. I did research about when to replace your helmet. I really like the MIPS added protection
    Date published: 2020-10-14
    Rated 5 out of 5 by from super helmet Fits EXACTLY right!! Looks fine and has the MIPS feature I wanted.
    Date published: 2020-09-04
    Rated 4 out of 5 by from Upgraded to MIPS I recently had a run-in with a tree wearing my old One K Helmet. Following the adage that when the head goes boom, the helmet goes buh bye, I decided to upgrade to MIPS technology The helmet seems pretty much the same except for a slim plastic layer between the liner and the helmet. It's a pricey piece of plastic, but I guess my brain is worth it if it really works. I wore a M in my old Defender and the M in the MIPS felt slightly snugger so I also ordered a L to compare. L was definitely too big, but the M still feels a tad snugger than my pre-MIPS medium. Maybe it's simply because my liner had squished down over time. I gave this a 4 simply because of price and maybe a slight size difference (I wish there was a M and a half). I look forward to being able to use the Custom Color System and the Snap-On Sunglasses when I can find them available for purchase!
    Date published: 2020-08-31
    • y_2020, m_11, d_30, h_16
    • bvseo_bulk, prod_bvrr, vn_bulk_3.0.12
    • cp_1, bvpage1
    • co_hasreviews, tv_0, tr_4
    • loc_en_US, sid_22770, prod, sort_[SortEntry(order=SUBMISSION_TIME, direction=DESCENDING)]
    • clientName_smartpak
    • bvseo_sdk, net_sdk, 3.2.0.0
    • CLOUD, getContent, 47ms
    • REVIEWS, PRODUCT

    Q & A