Diane,
I tye alot of deer hair bugs and use GSP for that..small stuff like a goddard caddis I'll just use monocord Gel spun (GSP) has more strenth and is also slicker and may help in certian ways ,and the strenth virsus diamiter is the main reason most prefer GSP when stacking hair....and is stronger than kevlar of compareable size,Keep in mind that all threads with a 4lb. or more breaking strenth can cut the material,It's the tyer who controls the thread!

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"I've often wondered why it is that so many anglers spend so much money on,and pay so much attention to.the details on the wrong end of the fly line.If they took as much care in selecting or tying their flies as they did in the selection of the reel and rod,They might be able to gain the real extra edge that makes it possible to fool a fish that has,in fact,seen it all before" A.K.Best

Everyone wants to excel in this sport but at the same time we let traditionalists place restrictions on our tactics, methods, and ideas. I always assumed that fly fishing was a sport that allowed imagination, creation, adaptation, investigation, dedication, education, revelation? : Fox Statler, On Spinners (Not the dainty Dry Fly kind) "Spinner'd Minner Fly"

"Wish ya great fishing"

Bill