The Mons Royale Icon is the perfect year round staple. It excels both on and off the mountain in all conditions. This simple design uses our ultra-lite Merino Air-Con fabric. Nature's climate control - It keeps you cool when you're hot, warm when its not. Pack less. Do more. It excels both on and off the mountain in all conditions. This simple design uses our ultra-lite Merino Air-Con fabric. Nature's climate control - It keeps you cool when you're hot, warm when its not. Pack less. Do more.