I think I used up this 3mL/0.1fl oz. tube of Phytomer Hydrasea Ultra-Moisturizing Polarized Water Serum in all of 2 days, so this will be a quick review ^.^
Early last year I ordered the full size of the Hydra Original Thirst-Relief Melting Cream and a couple of other things via Le Spa USA (not affiliated!). With that order, I hit the jackpot and ended up with dozens of samples, a lot of which I gave away to my mum. With the ones I kept, it's only recently that I've begun to go through them one by one.
I forgot to take a picture of the product itself, but this was a serum in a light emulsion with melty consistency though not quite runny either. The gel cream was a pastel blue and scented with a nice fresh scent, similar to that of the Thirst-Relieft Melting Cream. And although an emulsion, it went on more like a Japanese lotion, i.e. a thin viscous toner, only without the slightest stickiness and absorbed instantly and completely.
I did like this serum and will probably get the full size when I see a good promotion for it. I think it would be a great product to use in a hot and humid summer. When I was using it though I did layer a moisturizer over to seal in the moisture, that's just how dry my skin is. If you have oily skin and you like in humid environment, I would imagine this alone would be adequate.