| What it is | High-performance synthetic insulation |
| Made of | Ultra-fine microfibers (down-like) |
| Key trait | Warm when wet, soft, packable |
| Grades | PrimaLoft Gold, etc.; recycled options |
PrimaLoft is a brand of high-performance synthetic insulation made of ultra-fine microfibers that mimic down’s softness, warmth, and packability while keeping much of their warmth when wet. Originally developed for the U.S. military as a water-resistant down alternative, it comes in many grades (such as PrimaLoft Gold) and increasingly uses recycled and bio-based fibers.
Grades and tech
The premier synthetic insulation brand; its top tier is PrimaLoft Gold, with aerogel CrossCore tech.
Frequently asked questions
What is PrimaLoft?
PrimaLoft is a leading brand of synthetic insulation built from extremely fine microfibers that imitate down's loft and softness. It provides warmth for its weight, compresses well, and crucially retains much of its insulating ability when wet, making it a popular high-performance alternative to down in jackets and sleeping bags.
Is PrimaLoft as warm as down?
Top grades of PrimaLoft approach down's warmth-for-weight but generally don't match the very best down for packability and ultimate loft. Where PrimaLoft wins is wet performance and value — it keeps you warm when damp and dries faster — so it's often chosen for wet climates and active use over down.
What are the different PrimaLoft grades?
PrimaLoft offers a range tuned for different needs, including PrimaLoft Gold (its warmest, most premium tier, sometimes with features like Cross Core aerogel technology), plus Silver and Black tiers and active and bio-based versions. Higher tiers generally offer better warmth-for-weight and more recycled or sustainable content.
Sources
- PrimaLoft insulation — PrimaLoft
- Synthetic insulation — The Mountaineers