Perfectly sized for Crate & Kids trundle beds, the BeautySleep® firm twin trundle mattress is engineered to balance comfort and support (so even sleepover guests wake up well-rested!). Its combination of soft and adaptive firm foam helps it conform to kids' bodies and relieve pressure points through the night. At the same time, it has a bounce-back quality that helps children sink into their dreams—not the mattress. Its ClimateCool™ cover wicks away heat and enhances breathability, keeping kids comfortable even on warm nights.