Hi Sue,
 
If you suffer with heat at night you should avoid any mattresses with memory foam as a component part as this product is very heat retentive. I note that you also want what I assume to be hypoallergenic and therefore you are best avoiding products with natural upholstery layers. We do have a hand made 100% latex or hybrid foam mattress range, which may assist in this regard but are not sold as hypoallergenic in particular.
 
For further advice or guidance on the most suitable product in our ranges, please call our office. Kind regards.