Pro Tennis Player Tommy Paul's Must Haves Include an $8 Training Secret

Sleep isn't something Paul takes lightly. "If I don't have the right pillow, my neck will be in kinks, and it's no good," he says. He isn't picky about what's inside — down or foam works — but the height has to be just right. "I hate feeling like I'm lying down like this," he says, tilting his head upward. The Brooklinen Down Alternative Pillow ($69) allows you to pick how supportive you want it to be, and for Paul, we're thinking it'd be on the firmer side.