According to Craig Matthews of Blue Ribbon Flies of Yellowstone, MT, Z-Lon is a totally different product from Antron, although tyers often think they have very similar characteristics. Z-Lon holds its shape and does not mat together when wet like Antron. Nothing is better for natural looking shucks and wings on patterns like the X-Caddis. Colors: white, light dun, olive/brown, dun, ginger, amber, light olive, brown, dark olive, black. Item# 9356