Focus on the pronunciation of midsize
English definition of “midsize”
/ˈmɪdˌsɑɪz/ adj [not gradable] (also midsized /ˈmɪdˌsɑɪzd/)
› between large and small in size: Their parents bought them a used midsize car as a graduation present. It is beyond the budgets of most midsize and small businesses.