Instruction: Parse the product information to locate the target attribute, and then provide the extracted value of the target attribute and its source in the output, specifying None if the attribute is not present.

Input:
Product title: Baretraps Perform Womens Size 6.5 Black Fashion Mid-Calf Boots New/Display
Product description: The Baretraps Perform boots feature a leather upper with a round toe. The man-made outsole lends lasting traction and wear.
Product feature: Heel height/type: 1-inch, Height: Mid-calf, Shaft height: 13 inches, Material: Leather upper and man-made outsole, Circumference: 15 inches, Package Dimensions: 17.4 x 12.1 x 4.2 inches, Shipping Weight: 3.4 pounds, ASIN: B009VRBKOS, Date first listed on Amazon: October 24, 2012, Average Customer Review: 5.0 out of 5 stars 1 customer review
Target attributes: Shaft Height
Answer: attribute: shaft height
value: mid-calf
source: product feature
attribute: shaft height
value: mid-calf
source: product title