A memory foam mattress topper needs to 'trap' heat to work effectively, but this isn't great if you are a hot sleeper. This mattress topper is different. It has a layer of specialist memory foam that's been infused with a cooling gel. The gel helps reduce the warmth you'd typically experience with a memory foam topper, giving you a cooler night's sleep that's still supported by the benefits of memory foam. This topper will arrive tightly rolled in a vacuum pack which means a smaller package for a more fuel-efficient delivery. Soak&Sleep Cooling 6cm Memory Foam Mattress Topper in White Size: Double