Finally found the perfect pillow for my husband. I have been purchasing expensive 800 fill power European goose down pillows for years. This works well for me, but never seemed to provide enough support for my husband who totally destroyed these pillows in six months or less. This pillow is considerably heavier but also much more supportive for him, and as a bonus it sleeps cooler so he no longer wakes up with his pillow soaked from him sweating & being too warm. Down sleeps much hotter than this down & feather mix. Amazing how simply adding 15% goose feathers in the center chamber can accomplish this. Like all Matouk products (I have several of their down comforters & have purchased their plush yet lightweight, & long lasting Milagro zero twist towels for years) this pillow is very well constructed & made of fine quality fabrics. I think the medium contains the perfect mix of feathers & down for side sleepers as it is quite firm but at the same time still feels soft and helps align your spine. Not to mention this purchase is also a great bargain as I paid half as much for two of these pillows as I did for one of the 100% down pillows during Perigold's Labor Day sale. Highly recommend this Matouk pillow & Perigold!