JDM seats are fabric, and AFIAK the US never got factory heated seats. The Recaro seat in the VX is common to several other vehicles and is available aftermarket as well. Seat and lumbar heating, lumbar adjustment and ventilation are options offered by Recaro for the seat model.

The Axiom has similar seats to the VX and bi-level heating is a factory option, so that would be a simple upgrade to the VX for those in chillier climes or plagued by poor tushie circulation.

Rostra makes an aftermarket seat heater kit that is basically OEM components sold as a consumer installed kit. The biggest issue in installing it yourself is removing and replacing the seat covers, which can be a real challenge if you're not familiar with automotive upholstery. Most upholstery shops will install these for you or assist with the covers for a nominal fee.

Rostra Comfort-Heat