Cool Guava is a bright pink in the tube, but as with all the lip balms, it's a hint of the colour that ends on your lips. The smell of this lippie is just amazing - watermelon/mango flavours which remind you of a Caribbean holiday. There is a small amount of shimmer, but nothing too over the top that would put you off if you're not a shimmer girl. Another great thing about these balms is that they are very buildable. As the name says, they are sheer, but you can layer to make more of the shade. The formula is easy to apply and does feel like a balm as it should, but does feel quite creamy too. It's not the most moisturising lip balm in the world, but I usually apply Carmex before bed and in the morning to help keep my lips moisturised, and throughout the day if needed so this isn't a massive problem to me. Another highlight of the packaging (ok YSL definitely win on packaging front!) is that you know the shade of the lippie from the outside. It's a massive bonus in my opinion, as you know which shade it is straight away.
At £23.50, these lip balms don't come cheap, and remember that these are first and foremost lip balms with a hint of colour. If you're after a YSL lipstick, then I'd recommend the Rouge Volupte range which are also £23.50. However, for a general work day, these balms suit me perfectly. They're not too over the top but give you a hint of sheen, colour and luxury all rolled into one.