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: T&Grade Fashion Comfortable Lace-up Rubber Sole Flats Boards Walking Sneakers Oxfords
Product description: Rusway is a shoes brand expecially for teenagers and office workers. Rusway always choose the top quality material for shoes.
Product feature: Rubber sole, Best quality suede for shoes vamp., Good nature rubber for sole., Lace up design,easy on and off., Fashion business sneakers for men., Good foot feels., Package Dimensions: 12.6 x 7.8 x 4.5 inches, Shipping Weight: 1.8 pounds, ASIN: B0146D3WVA, Date first listed on Amazon: August 20, 2015, Average Customer Review: 3.3 out of 5 stars 18 customer reviews
Product brand: Rusway
Target attributes: Heel Height
Answer: attribute: heel height
value: flats
source: product title