Patagonia Micro Puff Jacket Synthetic jacket (L, black) - A super-lightweight synthetic jacket for alpine climbing, mountaineering and mountaineering at high altitudes - the Micro Puff Jacket from Patagonia! The elastic binding on the sleeves and hem will make for a great fit that is perfect for climbing. For insulation, Patagonia opted for the particularly lightweight synthetic PlumaFill fabric. For protection in wet conditions, the jacket's outer has been treated with a DWR, making it water repellent. When it's not in use, the jacket can be stuffed in the front pocket. For protection in windy conditions, the jacket also has a high collar. The Micro Puff Jacket from Patagonia is a versatile synthetic jacket with a small pack size and reliable insulation!