Dyneema is a high modulus polyethylene (HMPE) fiber that has gained popularity across the sailing industry. Extremely lightweight with ultra-high strength (at least as strong as steel wire at the same size), very low stretch, and excellent UV resistance, it is well-suited for use in halyards, control lines, and sheets.

Spectra is an amazing fiber that is very strong and durable. It has super low stretch, and is light enough to float. Spectra has the best fatigue life of any fiber. The only problem with Spectra is “creep”. Under steady high loads, Spectra will elongate very slowly. After a period of time, you might notice that your jib halyard now seems an inch looser. Using one size larger will greatly reduce creep, but it may still be noticeable. Spectra is the ultimate material for high fatigue and lightweight spinnaker halyards, guys & sheets. Spectra does not absorb moisture, which keeps it lighter on the boat.