Should there be a problem with the snaps falling off, then this is generally due to how it has been attached to the garment. We continuously work on minimizing these kind of problems, and today have very few of them. Pocket bags During the spring we will finish the stock of cotton pocket lining fabric we have been using up to now. Cotton is nice and soft. But since it attracts water it is not a very suitable fabric to use in technical garments like this.
Polyester attracts very little humidity.
No matter how technical of a garment we design, what you wear closest to your skin will play a make or break role for garment function. Cotton will attract humidity and cool down the skin. Wearing a fiber like Polypropylene, or some Polyesters, that does not attract any humidity, closest to the skin keeps you dry, much warmer and comfortable. The insulation will work as a transport layer. On cold days a fleece garment could be added between the underwear and insulation to add warmth.