I had been wearing glasses for years, until one day my optician says "have you ever tried contacts". So I thought I would give them ago. They are a soft lense and allow a high percentage of oxygen through to the eye. On first putting these in I wont pretend they where comfortable straight off. As with all contacts, putting something into your eye is not normal. But this is something you soon get used to. I wear these lenses on a monthly basis. I put them in at the start of a month and then eat, sleep and..... After wearing them continuously for this length of time they still feel comfortable. Even after a full nights sleep, I awake and my eyes feel fine. My left eye has a stigmatism, but these lenses seemed ok with that too. I have worn these on numerous occasions whilst working in the heat and dust of Iraq and again they worked well, with no problem. I know a few people who have tried these lenses and they have not got on with them. As with most contact lenses it is a matter of trial and error, but all in all these are very comfortable.