Of course, when configuring your Hussarde, you can choose without a mattress. We recommend using a mattress of the same size as those we offer (see the descriptions of the various Hussarde models). For the Hussarde Quatrö or Family, your mattress should not be any more than 5.5 cm in thickness.
When ordering, you can configure your Hussarde with other options, to have a truly customised tent. Further options can be purchased afterwards as you discover you need them.