I start out sleeping on my back but tend to sleep on my side as well. The Hullo supports both very well. I’ve been pleased with the Hullo and the support and coolness it gives my head and neck. The biggest challenge I have with it is getting it into the pillowcase (due to the weight and mass) but that is a very minor thing. I would recommend the pillow to others.
I would recommend Hullo to a friend.