By Foot Shape

• Slope
• Mountain
• Plateau
• Square

By Sole

• As Barefoot As Possible (<6 mm)
• Medium Thickness (6 - 10 mm)
• Moderate Thickness (>10 mm)

By Age

• Adult
• Big Kid/Teen
• Little Kid
• Toddler
• Baby

By Gender

• Male
• Female

By Width

• Narrow
• Average
• Wide
• Extra Wide

By Volume

• Low
• Medium
• High

By Type

• Hiking
• Running
• Sports
• Boots
• Casual
• Men's/Boys' Dress
• Women's/Girls' Dress
• Sandals
• Sneakers
• Slippers