The name says it best: the Phil & Teds woolly & warm seat liner is both woolly and super warm. Luxuriously cozy lambskin provides softness and keeps the seat of your phil&teds stroller mighty comfy. Lambskin never gets hot or uncomfortable, even on slightly warmer days (though the heat of summer might be a little much for lambskin). Note: In addition to being compatible with all current phil&teds strollers, this accessory is also compatible with the phil&teds e3 buggy (version 2).