Well i am here telling you a good product--self-adhesive warm pad--which can protect you against cold by temp.50degree.
its componet is iron powder, vermiculite ,salt,active carbon.
oxygen meet with iron powder, there is a chemical changes,

but its safe and release warm.

if you wish to have these samples, pls semd mail to

wawaodear@163.com

we'd like to have an agent in Russia,samples are mostly free.
Pls contact freely.
best regards
Lucia
From China