The Beal joker is an ideal rope for winter climbing. It works well for cragging, mixed, ice and alpinism. It works as a single rope. A burly 1/2 rope, and on moderate long routes as a twin rope. But I don't think I'd ever use it as a twin with a high impact force.
The Beal Joker 9.1mm UNICORE is the ultimate rope that conforms to all three dynamic rope standards; single, half, twin. climbers will hold tightly to the Joker for its multipurpose abilities on ridge and face routes, as well as mixed ice and snow. With Beal’s UNICORE technology, the sheath and core are permanently bonded together to eliminate sheath slippage and improve performance and safety. STRONG POINTS: • UNICORE Process • Single, half, and twin certified • Abrasion and water resistant with Golden Dry Cover
I only carry this in 70M length with the Beal's Golden Dry treatment.
UIAA Certified Water Repellent - Golden Dry
UC = Unicore Process