Is the OTTY suitable if I have allergies? OTTY 26 July 2019 13:38 Follow Absolutely it is! Our products are hypoallergenic, so should be perfect for those with allergies. Related articles I have sore back and joints. Would an OTTY mattress help? How would you rate the firmness of the mattresses? Me/my partner is pregnant. Can I use the OTTY? How would you rate the firmness of the mattress? I tend to overheat at night, will an OTTY mattress be suitable for me? Comments 0 comments Please sign in to leave a comment.