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: 2(X)IST Men's Sliq Micro Y Back Thong
Product description: Experience a nearly-naked fit with our y-back thong with a classic mid rise. Crafted in ultra-smooth fabric, you'll feel cool and comfortable every day. This style comes in a variety of different colors and prints.
Product feature: 92% Polyester, 8% Spandex, Imported, Pull On closure, Machine Wash, Ultra-low rise, Original contour pouch for added support, Open back, Dual supportive straps, Logo-detailed elastic waistband, Shipping Weight: 3.84 ounces ( View shipping rates and policies ), ASIN: B07L77JM4C, Item model number: 042302, Date first listed on Amazon: April 9, 2016, Average Customer Review: 4.0 out of 5 stars 24 customer reviews
Product price: $11.91 - $30.08
Target attributes: Silhouette
Answer: attribute: silhouette
value: thong
source: product title
attribute: silhouette
value: thong
source: product description