@Formidilosus I’m curious about trying this. I’ve seen some alpine climbers opt for 2 “lighter” belay puffy jackets, rather than 1 big giant puffy, so they can moderate temperature better. Regardless of which method is more optimal, how are you sizing these puffies to maximize loft when double layering them?
Are you sizing up both jackets so they’re both on the looser side to have more dead space to layer. For example, you’d typically wear a large, but get both puffies in XL. So either jacket could be layered on top of the other in any order.
Or, are you sizing the two jackets sequential with the intent to layer. For example, you’d typically wear a large, so you get one puffy in a large and the second in XL specifically to wear on top. So the jackets have a specific order to layer them.
Hope that makes sense. Id intuitively think you’d have to default to one of the above options, because if you layered two puffies that were true to your actual size, the top puffy would compress the loft of the bottom puffy.
Also, I used jackets as the example but I’m curious if the same answer would apply to puffy pants.