Be aware that reguardless of the type of ankle holster you use, a blue gun will rust like hell, do to the sweat. Stainless will help.
Galco's Ankle Glove uses sheepskin lining behind the holster to allow that area to breathe and reduce perspiration. The closed cell neoprene foam ankle band will not transfer perspiration to the holster.
Countless numbers of LEO's use these daily without any problems. Note: the Calf Strap is an optional accessory.