@SIro I think the plastic shield is different. They make it from the form of your actual chest, and you wear it when you’re irradiated. From what I understood (and was quite confusing) it acts as extra tissue for radiation to be more effective.
Mepitel is a prophylactic dressing, very similar to cling wrap, that you also wear during treatment, but it stays on you 24/7. It’s a lot thinner and lighter than the plastic shield.
I had both breasts done, so I took my shields home when treatment finished. They look like Wonder Woman’s top 😆😄🥰