Case Fair Isle Jumper in Navy Marl by Barbour Logan's of Lexington Jumper Case Fair Isle Crew Navy marl by Barbour Kid Boy WP Store Barbour Case Fair Isle Jumper In Navy Marl Barbour Lambswool Case Fair Isle Jumper Jules B The Best Fair Isle Jumpers, Including The John Lewis 49 Favourite Fair Isle Jumpers, Tanks & Cardigans. This crew neck sweater is knitted with a colourful Fair Isle pattern framed by contrast ribbing at the collar, hem and cuffs. Crafted in super soft lambswool, this distinctive piece is finished with a signature flag label at the side seam.