I had some leftover UV protection from my summer stint, so I continued using it even after fall arrived, but my skin suddenly started to become inflamed during the fall pollen season. I hadn't changed my skincare line, so I switched to this sunscreen and the inflammation gradually subsided. It's a lifesaver. However, it leaves a white cast immediately after application and has a heavy texture, so it's definitely not suitable for summer. It also seems to have moisturizing properties, so I think it's more suitable for fall and winter. I'll continue using it and hope it doesn't cause any irritation.