Instruction: Given the title, description, feature, price, and brand of a product and a set of target attributes, extract the value of each target attribute from the product information. Output the extracted value and the corresponding source (e.g., title or feature) denoting where the value is extracted.

Input:
Product title: Nike Mens Air Trainer Max '91 Bo Jackson Black/White 309748-004 Size 12
Product description: Nike Mens Air Trainer Max '91 Bo Jackson Black/White 309748-004 Size 12
Product feature: 309748-004 Size 12, Package Dimensions: 14 x 9.2 x 5 inches, Shipping Weight: 2.45 pounds, ASIN: B00H2QQVSK, Date first listed on Amazon: September 23, 2014, Average Customer Review: 5.0 out of 5 stars 1 customer review
Target attributes: Heel Style
Answer: attribute: heel style
value: None
source: None