The Best Fair Isle Jumpers, Including The John Lewis 49 Favourite Blue Fair Isle Jumper Children's Jumpers Brora Fashion Fair Isle Jumpers, Tanks & Cardigans Case Fair Isle Jumper in Navy Marl by Barbour Logan's of Lexington Barbour Case Fair Isle Crew Neck Jumper Willow Green Potters of Buxton. 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.