Garment systems include complete, independently wearable garments like gloves, socks, scarves, earmuffs, headbands, hats and the like having attached thereto one or more single-use, air-activated exothermic heating packs sealed in a substantially airtight envelope, which can be opened when it is time for use. Thus, according to embodiments described herein, a user can simply open a package and put on the garment(s), and the exothermic heating pack(s) will be automatically activated by exposure to air, without the user having to place a heating pack inside a special pocket or the garment or fit a heating pack to their body before putting on the garment. The garments can be discarded after use for disposal or recycling.
