Personally, I don't really care for primer too much, unless it's one that gives a high level of SPF protection. Primers with SPF can often be heavy on the skin, and any primer that combines a high SPF with a light texture is a winner in my book. NARS Multi Protect Primer has been my primer-of-choice for ages now, with its creamy texture and feather light finish. This Shu Uemura UV Under Base Mousse, however, has blown the NARS primer out of the water, taking lightness to a new level.
The mousse comes in a single shade called Beige - which is a little misleading, as despite the tiny touch of warmth in the product, it leaves no colour whatsoever on the skin once applied. I use about half of the amount pictured above for my whole face - roughly a walnut sized blob - and find that the air whipped mousse blends quickly and seamlessly across the skin. It sinks in incredibly quickly, and leaves the skin feeling completely clean, almost as if no product had been applied at all.
It's really the lightest, most unnoticeable primer I've ever used - which, given that it gives SPF 30 protection, is pretty damn impressive. At £29 a can, it's reasonably expensive - but as with the NARS product, it's absolutely worth it. If you'd like to try it for yourself, you'll find it at the Shu Uemura website.
Disclosure: PR sample