I started using these deodorants during the last winter. I left a review for my initial purchase, and stated then that I was pleasantly surprised by the performance of the deodorants but felt that they were not being challenged by the weather at that time. So, fast forward four months and we’ve had some very warm weather. I have to say that I find that this and the lemon and geranium balm I purchased both work very well at keeping my underarms odour free - even on days when I’m very active. I am however struggling with the sensation of dampness in my armpits, because of course they do not stop me from sweating. 40+ years of using an antiperspirant means that it’s quite an alien and unpleasant sensation unfortunately. Time will tell as to whether or not I can adjust.