What makes this insert different? Made in 3 weights of the finest materials to support your ideal sleep temperature: our down is ethically sourced from farms in the U.S. and triple washed to guarantee a cleaner, longer-lasting loft. Wrapped in a soft, breathable, down-proof shell, each insert has a unique bafflebox construction that keeps the fill perfectly in place to maintain fluff and shape over time. The Weight for Your Ideal Sleep Temperature Warm Sleeper or Climate – Lightweight Comfortable Sleeper or Climate – Midweight Cool Sleeper or Climate – Ultra-weight