Boat length*	Maximum forestay diameter	PROFURL Basic Models	Application cruising
5 to 7 m (18 to 23 ft)	5 mm (7/32 '')	T 26	X
7 to 9 m (23 to 30 ft)	7 mm (9/32'')	B 29 S	X
8,50 to 10 m (28 to 35 ft)	7 mm (9/32'')	B 29 L	X
9 to 10.50 m (30 to 36 ft)	10 mm (3/8'')	B 35 S	X
10 to 12 m (35 to 40 ft)	10 mm (3/8'')	B 35 M	X
11 to 13.50 m (37 to 42 ft)	10 mm (3/8'')	B 35 L	X
* given for average displacement monohulls For multihulls and heavy displacement boats or staysails please refer to forestay diameter.

		PROFURL models		Application
Boat length*	Maximum forestay diameter	Classic	Elite	Cruising	Racing
6 to 8.50 m (19 to 28 ft)	6 mm (1/4'')	R 25	-	X	X
7.50 to 9,50 m (24 to 34 ft)	8 mm (5/16'')	NC 32	-	X
8.50 to 10 m (28 to 36 ft)	8 mm (5/16'')	LC 32	-	X
9 to 11 m (30 to 36 ft)	8 mm (5/16'')	C 32	C 32 E	X	X
9 to 11 m (30 to 36 ft)	8 mm (5/16'')	R 35	R 35 E		X
11 to 14 m (37 to 42 ft)	10 mm (3/8'')	NC 42	NC 42 E	X
12 to 15 m (40 to 50 ft)	12 mm (1/2'')	LC 42	LC 42 E	X
10 to 13 m (32 to 41 ft)	10 mm (3/8'')	R 42	R 42 E		X
11 to 15 m (37 to 50 ft)	12 mm (1/2'')	C 42	C 42 E	X	X
11 to 16 m (37 to 53 ft)	12 mm (1/2'')	LC 42 S	LC 42 SE	X
12 to 18 m (40 to 60 ft)	14 mm (9/16'')	LC 42 R	-	X	X
15 to 22 m (50 to 66 ft)	16 mm (5/8'')	N 52	N 52 E	X
16 to 25 m (53 to 82 ft)	19 mm (3/4'')	L 52	L 52 E	X
22 to 35 m (66 to 110 ft)	25,4 mm (1'')	N 70	N 70 E	X	X
* given for average displacement monohulls For multihulls and heavy displacement boats or staysails please refer to forestay diameter.

Note : you should never undersize a reefing system. A system should be more likely selected in the middle of the range of use, forestay diameters shown here are maximum dimensions.