&Boost+ is where V&YOU pouches get strong. Each one carries 15mg of nicotine (27mg/g), rated 5 out of 5 by the brand, with 20 pouches per can. It's made for people who already use 10mg pouches and want more.
15mg per pouch is a big step up from &Boost. If you haven't used 10mg pouches before, start with a lower strength and work your way up. If you have, &Boost+ gives a strong nicotine feel with the same slim, discreet fit.
Boost Max is even stronger, at 19.8mg per pouch. That's a quite a jump, though, and it's only recommended for very experienced users.