An article of footwear having an upper and a sole structure secured to the upper, the sole structure comprising: a midsole formed from a foamed polymer material and positioned adjacent to the upper; a first impact-attenuating member (795; 895; 995) located in a heel portion of the sole structure; an upper plate (752; 852; 952) embedded within the midsole and formed from a non-foamed polymer material having an upper surface oriented toward the upper and an opposite lower surface oriented away from the upper; a first leg (755; 855; 961) formed from a non-foamed polymer material extending downward from the lower surface of the upper plate (752; 852; 952) away from the upper, a lower portion of the first leg (755; 855; 961) forming a portion of the first impact-attenuating member (795; 895; 995); and an outsole at a bottom portion of the article of footwear opposite the upper configured to engage the ground during use, further comprising a lower plate (754; 854; 954) formed from a non-foamed polymer material oriented generally parallel with the upper plate (752; 852; 952) and forming an upper region of the outsole, the first impact-attenuating member (795; 895; 995) being disposed between the upper plate (752; 852; 952) and the lower plate, characterized in that the first leg (755; 855; 961) includes a plurality of tines extending laterally away from the first leg (755; 855; 961) and configured to engage portions of the first impact-attenuating member (795; 895; 995), and/or the first leg (755; 855; 961) includes a pair of spaced apart parallel legs, lower portions of the pair of spaced apart parallel legs forming a pair of support element members disposed in the first impact-attenuating member (795; 895; 995). a midsole formed from a foamed polymer material and positioned adjacent to the upper; a first impact-attenuating member (795; 895; 995) located in a heel portion of the sole structure; an upper plate (752; 852; 952) embedded within the midsole and formed from a non-foamed polymer material having an upper surface oriented toward the upper and an opposite lower surface oriented away from the upper; a first leg (755; 855; 961) formed from a non-foamed polymer material extending downward from the lower surface of the upper plate (752; 852; 952) away from the upper, a lower portion of the first leg (755; 855; 961) forming a portion of the first impact-attenuating member (795; 895; 995); and an outsole at a bottom portion of the article of footwear opposite the upper configured to engage the ground during use, further comprising a lower plate (754; 854; 954) formed from a non-foamed polymer material oriented generally parallel with the upper plate (752; 852; 952) and forming an upper region of the outsole, the first impact-attenuating member (795; 895; 995) being disposed between the upper plate (752; 852; 952) and the lower plate, characterized in that the first leg (755; 855; 961) includes a plurality of tines extending laterally away from the first leg (755; 855; 961) and configured to engage portions of the first impact-attenuating member (795; 895; 995), and/or the first leg (755; 855; 961) includes a pair of spaced apart parallel legs, lower portions of the pair of spaced apart parallel legs forming a pair of support element members disposed in the first impact-attenuating member (795; 895; 995).