I just spent the weekend in Big Basin State Park and brought two kilts with me, a Stillwater Standard and a cotton "X Kilt". Saturday the temperatures reached 98 degrees and it was too warm to wear the Stillwater for vigourous activity. I absolutely love my Stillwater Kilts but because there aren't cutouts in the pleats you can get a bit hot/sweaty around the waist.

I think that a USA Kilt or a Sport Kilt would be better if you are worried about heat.

Cheers

Jamie