Instructions included, and  sturdy, but one caveat...becomes stiff in freezer
The 2 gel packs came well packaged and with instructions. They seem sturdy. However, after an overnight in my freezer the gel pack is quite stiff...has to thaw a bit to fit body contours. (More-so than an older gel pack also in freezer.) Did not evaluate how the gel pack does in the microwave, as I plan to use mine to bring down swelling after surgery.
Rating: 4 stars