Kenai ULTRA Vest

The Kenai ULTRA Vest is an ultralight core insulator suitable for day hunts or extended backpack hunts. Its 3DeFX+ synthetic insulation adds the warmth needed for active adventures in cold places when keeping your core warm is vital. The insulation is body mapped for comfortable use with a backpack.

• 8.4 oz.
• 100% Nylon, 51g Toray Stunner Stretch 30D
• Toray 3DeFX+ synthetic insulation – 90g front
• Toray 3DeFX+ synthetic insulation – 60g back / sides / collar
• Highly breathable
• Toray DWR

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SKU # 50027
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  • lifetime warranty on all our gear

Product Overview

The ULTRA name in a KUIU product signifies a priority for streamlined design and ultralight weight. Combining industry leading fabric and hardware with Toray 3DeFX+® insulation has opened the door to a category of highly breathable insulation pieces for active use, that are perfect for high-output cold weather mountain hunting applications.

3DeFX+ synthetic insulation is the first of its kind to incorporate continuous fiber technology. The long spiral strands of fill are loftier and warmer than any other synthetic insulation on the market, and don’t require fabric coating to keep the insulation from migrating through the fabric.

Kenai ULTRA vest features insulation mapping, which offers higher insulation in the front for warmth, with lighter insulation on the back for added breathability and better temperature control while wearing a pack.

The 30D Stunner Stretch® nylon face fabric is strong, light, and dead quiet. Uncoated fabric and insulation mapping allow us to make a vest that breathes at an exponentially higher rate, keeping the user dryer, warmer, and more comfortable during long climbs and extremely active use.

• Insulated mid to outer layer
• High warmth-to-weight ratio
• 2-way stretch fabric
• Quick drying
• Wind resistant
• DWR to repel water
• Zippered hand pockets
• Zippered chest pocket
• Adjustable hem
• YKK Zippers
• NYLON 66 cording
• DURAFLEX hardware


3DeFX+® by Toray

Warmth and Flexibility Intersect

Toray’s 3DeFX+® combines insulation made from coil-shaped fibers and stretch fabrics to provide unmatched warmth and freedom of movement. Its continuous fiber technology is loftier and warmer than other synthetic insulation options, and perfect when the need for extreme warmth and flexibility intersect.

Featured in our Kenai ULTRA Hooded Jacket, Insulated Snap Shirt, and Kutana Hybrid 3DeFX+ Jacket

Kudos XR DWR


K DWR® (KUIU Durable Water Resistant)

K-DWR is the first line of defense for keeping you dry. It keeps water from penetrating the outer-layer fabric, which promotes breathability and performance.

Featured in all our Rain Shells, Guide Series, Tiburon Products, Chinook Products Alpine and Attack Pants

Stunner Stretch

Stunner® Stretch Fabric by Toray

Lightweight, Stretchable Comfort

Toray develops a new fabric technology and KUIU brings it to Mountain Hunters first! Ultralight, down-proof Stunner Stretch fabrics stretch as you move and put a layer of luxurious comfort between you and the warm softness of KUIU’s premium Polish down. And, of course, Stunner Stretch minimizes bulk and weight.

Featured in our Superdown Products

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