340 top version ARC TERYX Archaeopteryx Spandex inner layer 94 polyester fiber 6 spandex product features Gamma is Arc'teryx's universal soft shell product line MX, which means it is suitable for mixed weather and all aspects of performance are taken care of without any obvious emphasis. Gamma MX is famous as the Top Seller of Arc'teryx soft shells. The Tiger Balm type product is a series for both urban and outdoor use. It has thin fleece inside, suitable for mixed activities in changeable weather. Gamma MX has more pockets. There are two symmetrical chest pockets on the front and two hand pockets. When necessary, the pockets can be fully opened. The old model has a laminated pocket on the left arm to assist heat dissipation. The new model has eliminated this design. The overall style is more simple. The fabric has been treated with DWR waterproofing, which can protect against short rains, snow and dirt. The breathability is better than WindStopper, but it is slightly less windproof and waterproof. The performance and fabric texture are better than the same series size SMLXL