We’re spoilt for choice these days when it comes to leaders. Overall, I’m very much a fan of the monofilament knotless tapers though even the fluorocarbon brands can be painfully slow to sink. Sinking polyleaders, however, act like mini sink-tip lines, taking your flies to greater depths more quickly. Best of all they come in a range of sinking densities and lengths, usually of five foot, seven foot and 10 foot. If you want to attain maximum depth then opt for the 10 foot leaders. Be mindful that your actual tippet length should be quite short so the polyleader has instant effect (diagram 2). A long tippet might sound good in theory, though you often end up with a sagging leader when even weighted flies fail to pull a lengthy section monofilament tippet down at the rate of a polyleader (diagram 3).
Fly line Sin kin g po lyl ea de r Long mono leader tends to sag and fail to sink in a uniform manner, creating loss of contact.
Fly line Sin kin g po lyl ea de r 18-24in Short mono tippet means more direct contact.