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: Polo by Ralph Lauren Sander Mary Jane (Little Kid/Big Kid)
Product description: Polo Ralph Lauren children's footwear has all the fashion, fit and redefined classic American styles that you have come to expect from this brand. Polo Ralph Lauren footwear is designed with exquisite materials and meticulous detail. Styles range from classic, vintage and preppy slip-ons and boat shoes to athletic-inspired sneakers and casual wear. Whether it is a day at the park or a night on the boat, your child will embrace his or her style with Polo kids' shoes.
Product feature: 100% Canvas, Rubber sole, Package Dimensions: 10 x 6.1 x 3.8 inches, Shipping Weight: 1.3 pounds, ASIN: B005HEJZRI, Item model number: Sander - K, Date first listed on Amazon: March 5, 2012, Domestic Shipping: Item can be shipped within U.S., International Shipping: This item is not eligible for international shipping. Learn More, Average Customer Review: 5.0 out of 5 stars 2 customer reviews
Product brand: Polo Ralph Lauren
Target attributes: Silhouette
Answer: attribute: silhouette
value: mary jane
source: product title