MFC GSP Thread

Tie stronger flies with less thread. MFC GSP (Gel Spun Polyester) Thread is incredibly thin yet pound-for-pound one of the strongest tying threads available — letting you lock down materials with minimal bulk and maximum holding power.

GSP excels anywhere you need a secure, low-profile foundation: spinning deer hair, tying saltwater patterns, building tight heads, or working with slippery synthetics that standard thread can't grip. Once you tie with it, you won't go back.

• Gel Spun Polyester (GSP) construction — ultra-strong, ultra-thin
• Minimal stretch for precise tension control
• Excellent for spinning deer hair, saltwater flies, and synthetic materials
• Low bulk for clean, professional-looking heads and bodies
• From MFC — trusted by tiers who demand performance