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One K (#29873)

One K Defender Jr Helmet

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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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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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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.
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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.
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Please call 1-800-461-8898 to order this product.
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Why We Love This

Finally, a One K™ designed for children riders in Junior sizing, offering the same protection, quality and comfort as the current One K™ range, but with smaller internal helmet diameter, a thicker padded liner, and a smaller chin strap which is 15mm shorter in length than the adult sizes. Certified to ASTM standards.

Additional One K Helmet Liners also available! 

Imported.

Helmets Comparison Chart

Check out the other items we offer from One K helmets Here!
  • Polycarbonate and Advanced ABS Composite outer shell; injection molded shell design
  • Washable quick-dry, moisture wicking, anti-microbial liner; stainless steel mesh
  • Comfort padded harness with synthetic suede lining, hook & loop adjustment
  • Fastex buckle; two side, two front, one back, and two center stripe vents
  • 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
  • SEI/ASTM F1163.15
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of customers would recommend this product to a friend!
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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.

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Ingredients

(Maintenance Dose = )
Ingredient Per Serving Per Pound

Sizing

Child's helmet, please refer to size chart.

XS - 47-48CM (5 7/8 - 6)

S - 49-50CM (6 1/8 - 6 1/4)

M - 51-52CM (6 3/8 - 6 1/2)
What Customers Say:
sizing chart

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    Reviews

    One K Defender Jr Helmet is rated 5.0 out of 5 by 1.
    Rated 5 out of 5 by from Fantastic Jr. Helmet This is a great helmet for a junior rider. Lower profile and better fit for a small head which is imperative for safety. Looks great and durable. Glad there is finally a JR helmet available for children that is great quality and safe
    Date published: 2019-01-11
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    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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