Bumbleride Footmuff & Seat Liner The add-on Footmuff & Seat Liner accessory attaches easily to Indie, Speed, Indie Twin, Flite and Indie 4 models. Its warm construction is made of 100% recycled plastic bottles (rPET). Details - Accommodates Indie, Indie Twin, Speed, Flite & Indie 4. - Seat liner can be used with or without Footmuff. - Machine washable on cold water, gentle cycle with air or line dry only. - Generous size for both infants and toddlers.