Article of footwear with multiple durometer outsole

An article of footwear comprising:

• a sole structure to engage a ground surface, the sole structure comprising:
• a first portion including a first top surface, a first bottom surface, and a plurality of first lugs, each first lug extending from the first bottom surface of the first portion to a first free end, wherein a first distance is defined between the first bottom surface of the first portion and the first free end of each first lug;
• a second portion including a second top surface, a second bottom surface, and a plurality of second lugs, each second lug extending from the second bottom surface of the second portion to a second free end, wherein a second distance is defined between the first bottom surface of the first portion to the second free end of each second lug;
• wherein:
• the first distance is greater than the second distance;
• each first lug has a first durometer, each second lug has a second durometer, and the second durometer is greater than the first durometer;
• and
• each first lug is compressible during use of the article of footwear, in which a wearer of the article of footwear engages the ground surface with the sole structure, such that each first lug compresses to decrease the first distance to a third distance defined between the first bottom surface of the first portion to the first free end of each first lug, and the third distance equals the second distance.