
Do Your Research: Insulation Types
AT KUIU, WE OFFER TWO TYPES OF INSULATION -
QuixDown, which is made from Polish goose down and 3DeFX+ which is made from continuous synthetic fibers. Both insulation types have performance advantages that will keep you comfortable on the toughest hunts. When deciding what’s best for you, consider your level of activity and the weather conditions.
STATIONARY VERSUS ACTIVE
MID LAYER AND OUTER LAYER INSULATION
The weather and conditions are the deciding factor on where you decide to layer your insulation. If it’s cold, dry, and clear, it’s suitable to wear it on the outside. If it’s cold and wet, layer insulation under your rain gear.
We offer two styles of fit among our insulating layers. A mid-layer fit is sized to fit close to your body with minimal layers underneath. An outer-layer fit is sized to fit over base layers and mid layer insulation. For example, if you’re a size large, these combos would layer well together:
MID-LAYER INSULATION LAYERING EXAMPLE:
- Merino 145 Zip-T | Fit: Base-Layer, Size: Large
- Kenai Jacket Fit: Mid-Layer, Size: Large
- KUIU Kutana Storm Shell Jacket | Fit: Outer-Layer, Size: Large
OUTER-LAYER INSULATION LAYERING EXAMPLE:
- Merino 145 Zip-T | Fit: Base-Layer, Size: Large
- StrongFleece 235 Hoodie | Fit: Mid-Layer, Size: Large
- Kenai Vest | Fit: Mid-Layer, Size: Large
- Super Down PRO Hooded Jacket | Fit: Outer-Layer, Size: Large
If you’re planning on wearing a garment sized with a mid-layer fit over multiple layers or you prefer a roomy fit, consider sizing up one size.

SUPER DOWN ULTRA- JACKET, VEST, AND PANTS
This series is geared towards those seeking ultralight packable insulation, ideally worn under rain gear or over base layers when brush-busting durability isn’t required. They’re so lightweight, you’ll think we shipped you an empty box, but they’re surprisingly warm for how light they are.
PROTECTION: Water-Resistant, Wind-Resistant, Insulated
MATERIAL: 12D Stunner Stretch Nylon, 850+ FP Water-Resistant QuixDown
FIT: Mid Layer Fit
CONDITIONS: Cold/Wet

SUPER DOWN PRO- JACKET, PANT, AND GLASSING GLOMITT
The Super Down PRO series is the ideal insulating layer when temperatures plunge and during low-level activity—like glassing or sitting in a stand. Super Down PRO is insulated with twice the down as Super Down ULTRA, making it KUIU’s warmest down insulation.
PROTECTION: Water-Resistant, Wind-Resistant, Insulated
MATERIAL: 30D Stunner Stretch Nylon, 850+FP Water-Resistant QuixDown
FIT: Outer Layer Fit
CONDITIONS: Extreme Cold

KENAI - JACKET AND VEST
The Kenai series keeps you warm in cold temperatures without overheating. Breathing far better than other insulation layers, Kenai keeps you comfortable during strenuous activity. They’re ideal as a super-warm mid-layer, or as a quiet outer layer during cold dry weather.
PROTECTION: Water-Resistant, Wind-Resistant, Insulated
MATERIAL: 30D Stunner Stretch Nylon, 3DefX+ Synthetic Insulation
FIT: Mid Layer Fit
CONDITIONS: Cold/Wet

KUIU KUTANA GALE FORCE
Built for extreme cold, wet, and windy conditions, the Gale Force Jacket and Pant combines a durable, 100% waterproof, seam-taped shell with highly breathable 3DeFX+ synthetic active insulation.
PROTECTION: Waterproof, Windproof, Insulated
MATERIAL: 70D/80D Stretch Nylon 6/6, Entrant Waterproof Membrane, 3DefX+ Synthetic Insulation
FIT: Outer Layer Fit
CONDITIONS: Extreme Cold
INSULATING LAYERS
KUIU’s skin-to-shell layering system allows you to adjust your level of insulation to correspond with the facing weather, activity level, and personal preferences. Whether you decide on Quixdown, 3DeFX+, mid layer, or outer layer insulation types, understanding the purposes they’re engineered for will help you leverage their built-in performance advantages on your next hunt.