The Mouse Kids Funsies may have you craving cheese. As long as you avoid those pesky traps, you’re free to relax while wearing this mouse pajama set. Whether you’re taking a nap in a mouse hole or out on Halloween trick-or-treating, this mouse costume will fill all of your comfort and warmth needs. Availability: The Mouse Funsies ships in 1-2 business days. Exchanges for size. Sizing: Small Fits 4-6; Medium Fits 8-10; Large Fits 10-12.