Yes it is! Something hydrophobic "fears" or repels water, preventing it from interacting or mixing with it easily (water-repelling). In nature, the hydrophobic properties of duck feathers leaves repel water, helping these organisms to stay dry or clean. For Outerwear: Moisture Management: One challenge in colder environments is managing moisture. If moisture is trapped within clothing, it can lead to a rapid loss of body heat. Eiderdown's hydrophobic quality ensures that humidity is repelled, maintaining the insulating layer's effectiveness. Insulation: Eiderdown is used in our outerwear because of its unmatched insulation capabilities. Its ability to trap and retain warm air close to the body means that even a thin layer of eiderdown can provide significant warmth. Lightweight Warmth: Eiderdown provides warmth without adding significant weight, making it ideal for outdoor enthusiasts who require light yet warm gear.