Take a measurement tape and your posture should be nice and straight, without holding in or sticking out your stomach, Locate the bones on the right and left side of the abdomen. For Malebasics Underwear measure approx 5 Inches under the belly button. Now locate the range between any of the values on the table and that would be your size.
The bikini cut is the closest thing to a Speedo type.
A Brazilian brief flat in front, tight around the leg and loose around the waist.
The most popular cut, trunks are similar to boy shorts.