Maxima Chameleon is very hard and abrasion resistant tippet material. Its dark brown color is infrared sensitive to blend with the surroundings when submerged. It is best when fishing deep. For those reasons it has become the most popular salmon and steelhead tippet for Skagit style fishing with your fly sunk near the bottom.
I first discovered Chameleon in about 1969, while attending a Sandy River Chapter of Northwest Steelheaders. Maxima rep, Ben Silknitter was the guest speaker. Ben was one of the most persuasive tackle salesmen I ever met. I left the meeting light on money, but rich in leader material. It is still the best when running your gear deep and that includes patterns like: Signature Intruders, Lady GaGa's, Mark's Marabou Spey Intruders. Chameleon is tough, reliable leader material that holds knots and is apparently hard for fish to see. Seems as though my catch rate goes up on dark days when Maxima Chameleon is the connection between my dark sinking tip and my big fly, which is often also dark, but flashy.
Trout fishers who specialize in keeping their nymphs near the bottom, like Chameleon for the same reasons Skagit style steelheaders, and Chinook anglers like it.