Oops, I meant to say that all of the high-quality continuous fiber polyester insulations are greatly SUPERIOR to the short-staple insulations, at least for sleepign gear. That would include Primaloft, Thermolite, Thermoloft, LiteLoft, etc, etc. The reason is that the short staple insulations are either heavier per sqyd for a given amount of insulating power, or else are less durable. For clothing, it is a different story, since clothign has to be tightly quilted and there is so much shell fabric, zippers, etc that the weight and durability advantages of continuous fiber insulation tend to swamped by other factors.