Sportkilt (as their name implies) is good for sports of all kinds: running, highland games, mudding, etc. They are washable, comfortable, have a touch of elastic in the back of the waistband and (if you measure properly) don't need a belt. They also have a microfiber "Hiking kilt" which is good for active wear as well. The regular sportkilt has a larger selection of tartans, both clan and universal. (full disclosure: I have an original sportkilt in US Army, and Hinking kilt in Pacific Blue.) The lightweight with just three tartans is the hiking kilt I refer to. I have a Heritage of Scotland PV, but IMHO, it's not quite an activewear kilt but more a casual to semi-casual kilt.