Having the proper sail for the sailors weight is equally as important as spars and foil weights. 

Here is the chart for recommended sails according to sailors weight ( CD, J sail, and One Sail)

Opti Sail Chart:

CD Sails:

Sail, CD, Opti Race - Flat (Up to 35kg) <77 LB 

Sail, CD, Opti Race - Medium (35-42kg) 77-92 LB 

Sail, CD, Opti Race - Power (42kg+) >92 LB 

Sail, CD, Opti Race - Booster (48kg+) >105 LB 

Sail, CD, Opti Race - DRS Custom (40-50kg)  88-110 LB 

Sail, CD, Opti Race - DRS++ (50+kg)  >110 LBS 

J Sails:

Sail, J, Opti Race Green Classic, 2.0, >75 LB

Sail, J, Opti Race Blue Classic, 2.0, 3.0, 75-95 LB

Sail, J, Opti Race Red Classic, 2.0, >95 LB

Sail, J, Opti Race Black Classic, 2.0 , >110 LB

One Sails:

- Standard Light (<36kg)<80Lb

- Standard Medium (36 to 42kg)  80>92 LB

-Standard Medium+ (42 to 47kg) 92>103 LB

- Standard Heavy+ (>47kg) 103 LB >

- Advanced GM (36 to 42kg)  80>92LB

- Advanced GMP (42 to 45kg) 92>99LB

- Advanced AH (45 to 48kg) 99>106 LB

- Advanced AHP (> 48kg) 106LB >