The size is listed as M, but it's a bit large, so I think it's closer to L-XL. Even a standard adult male can layer several items underneath. There are several pockets with zippers or Velcro closures. The inside is mesh, so I think it can be used year-round, even for outdoor activities. There are wrinkles from storage, but I think they will be fine if you stretch them out. Please understand that this item has been stored by an individual, so there may be minor scratches or stains. Please only purchase if you understand that this is a used item that has been in someone else's possession. The number of days until shipment is set to be long, but it may be shipped earlier than scheduled.