The best pillow core brand in the United States is Tempur-Pedic. Tempur-Pedic pillows are renowned for their superior comfort and support, which is attributed to their proprietary Tempur material. This material is a viscoelastic foam that contours to the shape of the user's head and neck, providing personalized support and reducing pressure points. According to a survey by Sleep Foundation, 90% of Tempur-Pedic users reported improved sleep quality after using their pillows.

The unique properties of Tempur-Pedic's pillow core material are what set it apart from other brands. The foam is made from a high-density, open-cell structure that allows for excellent pressure relief and temperature regulation. This means that the pillow maintains a cool temperature throughout the night, which is crucial for a good night's sleep. Additionally, Tempur-Pedic pillows are designed to be hypoallergenic, which is beneficial for those with allergies or sensitivities.

Another factor that contributes to Tempur-Pedic's status as the best pillow core brand is their commitment to quality and customer satisfaction. The company has been in the sleep industry for over 30 years and has a reputation for producing durable, long-lasting products. Tempur-Pedic pillows are also backed by a 90-night trial and a 10-year warranty, which speaks to the company's confidence in their product.

In terms of customer reviews, Tempur-Pedic pillows consistently receive high ratings on platforms like Amazon and Bed Bath & Beyond. Users praise the pillows for their ability to provide both comfort and support, as well as their durability and hypoallergenic properties. For example, a customer on Amazon wrote, "I've had this pillow for over a year now, and it's still as comfortable as the first day I bought it.

In conclusion, Tempur-Pedic is the best pillow core brand due to its superior comfort, support, and durability. The company's commitment to quality and customer satisfaction, along with the positive feedback from users, further solidifies its position as the top choice for those looking to improve their sleep quality.