The wraps
A heat wrap is a simple thing done properly: cotton, rice, and dried herbs, sewn so the fill never bunches or shifts.
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Rice holds heat longer and more evenly than wheat or flaxseed, and it doesn't develop the faint burnt smell those fillings can get after repeated warming. It also takes to cold just as well, so the same wrap works pulled from the freezer as it does from the microwave.
A well-made wrap, warmed and rested rather than overheated, holds up for years. Keep it dry between uses, avoid direct flame, and store it flat rather than folded so the rice doesn't settle unevenly.
"Treat it like a good cast-iron pan. A little care, and it outlasts most things you own."