"The Wilson Beds 4"" Deep Firmer All Reflex Foam Mattress was designed primarily as a firmer option value for money basic mattress for children. It is a double sided firm feel mattress with a 100% virgin Reflex foam core. It is covered in the blue, breathable water resistant fabric. These mattresses are great for bunk beds, cabin beds and day beds due to their limited depth (10cm), but can also be used in caravans, mobile homes, camper vans, boats etc. The foam is naturally hypoallergenic and dust mite resistant. These mattresses are compressed, vacuum packed, rolled and boxed for easy handling and delivery. Please measure your bed before placing your order to ensure you receive the correct size. For best results, unwrap your new mattress within seven days of receipt, and allow the mattress to air in a well-ventilated area so that it can decompress for at least 72 hours prior to use."