>>1640108While I am not a furry, I do know that some heads are constructed with active cooling (fans). Comfort would depend on how long the battery lasts.
That said, fursuit heads tend to have poor vision, and that tail... safety hazard.
Moving on to the bodysuit, It looks to me like stretch-velvet, although can't rule out print polyester-spandex. As a spandex enthusiast with a velvet fetish, I can tell you that stretch velvet has EXCELLENT moisture management and thermal properties. By itself, a full-body suit is quite comfortable, even in hot weather. I am less certain about underneath a jersey, as shown. Just looking at it, also can't rule out that he is just wearing gloves and leg-warmers though.