Image-searches say their clothing appears to be long-sleeved, multilayered and often head-covering. I can't tell the weight or the fabric-type, but I'm pretty c

Image-searches say their clothing appears to be long-sleeved, multilayered and often head-covering. I can't tell the weight or the fabric-type, but I'm pretty certain they're not minimum-weight synthetics. That much insulation seems utterly counterproductive for hot-weather exertion, though it probably would at least protect from sunburn.