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: World's Softest Men's/Women's Classic Collection Crew Socks
Product description: World's Softest Men / Women Classic Collection Crew Sock! Need we say more? This comfortable crew sock delivers softness in its name and on your feet thanks to the cushiony terry that lines the sole that cradles your foot in shock absorbing comfort. Walk smoothly with the contoured heel and toe pockets that prevent slipping and bunching, while the low-profile toe seam prevents irritation.
Product feature: Acrylic, Durable nylon provides a stretchy, long-lasting fit., Ultra soft acrylic offers plush softness and wicks away moisture for superior comfort., High stress heel and toe areas are reinforced for durable wear., 75% acrylic, 23% nylon, 1% polyester, 1% spandex., Care: Machine wash inside out in warm water. Tumble dry on low heat., Product Dimensions: 8 x 3 x 0.1 inches, Shipping Weight: 1.6 ounces ( View shipping rates and policies ), ASIN: B00M0UPC9M, Item model number: 113376, Date first listed on Amazon: May 2, 2007, Average Customer Review: 4.4 out of 5 stars 629 customer reviews
Product price: $9.00 - $16.19
Product brand: World's Softest
Target attributes: Style
Answer: attribute: style
value: crew
source: product title
attribute: style
value: crew
source: product description