A classic bomber jacket with quilted lining adds warmth without bulk because the insulation is contained within the lining rather than throughout the jacket. Quilted lining means you can wear the jacket over lighter pieces and still feel warm. The construction is also more sophisticated than an unlined jacket because the quilting is a deliberate design choice. Quilted lining also means the jacket sits better because the weight is distributed properly. The lining usually peeks out at the collar and cuffs which adds a visual detail. Quilted lining makes the jacket perform better in transitional weather. These are the classic bomber jackets that justify their space because the quilted construction means they work in more seasons and over more outfits.