go for the smallest

take the smaller one)

(US Sizes)

But hey - you don't have to have a motorcycle to look cool in this

Vallon - Howlin' - Tortoise pol. Size:One size go for the smallestHigh quality sunglasses from a brand that has found an excellent balance between retro style, function, and quality: Vallon are two Swedish brothers who lived in the Alps and from there discovered which glasses they missed from the good old days. A rounded aviator design crafted from premium acetate, fitted with polarized V52 performance optics giving the highest clarity of any performance sunglasses on the market. They come with an optional headstrap