Multiple sizes available - select your preferred size from the dropdown. This Zinus tight top innerspring mattress with quilted cover is great for bunk beds, day beds and trundle beds. The innerspring system is made from heavy gauge steel coils to provide firm support. The top is quilted with layers of fiber padding and foam for comfort. Designed for firm support while you sleep, this tight top 15cm mattress from Zinus features a high-density comfort support foam layer and a steel innerspring system. Please ensure your address details, complete with contact number, are updated in your account.