SIZE that FITS: Chicken XS/Small: Bantam chickens 1-2 lbs. Chicken Medium: Bantam chickens 3–4 lbs. Chicken Large: Standard-sized chickens up to 10 lbs. Chicken XL: Standard-sized chickens 11+ lbs. Chicken XL+: Wider chickens 11+ lbs Duck XS/Small: Ducks 1–3 lbs. Duck Medium: Ducks 4–7 lbs. Duck Large: Ducks 7–14 lbs. [Refer to size chart photo for details] *Strap extenders and harness/leash add ons are available for purchase in our Amazon store. BABY-GRADE, hypoallergenic fabric - Made of premium cotton, rayon and linen, this ultra-soft, hypoallergenic, breathable fabric—often used in baby clothes—provides the highest level of comfort for your chickens and ducks! Inner lining: Linen, Cotton. Waterproof Pouch: Vegan Leather Outer shell: 100% Bamboo Rayon or 100% Cotton (depending on color). The Stars USA and Buffalo Plaid diapers are made of polyester and are stiffer but more water-resistant than the other designs. Hand washing is recommended to preserve the diaper's longevity. IMPROVED STRAPS and buckle - We heard you! Based on your feedback, we have upgraded our chicken diapers with more secure and comfortable straps and buckles to provide extra stability and ensure that the straps stay put. If your bird is wiggly and/or the poop pouch just would not stay put over the vent, use the provided clip (or any other clip/paper clip/velcro) to fasten the straps in place, right above the bird’s tail. Leak-Proof, No Mess - Comes with a Waterproof Poop Pouch that is large enough to fully cover the vent and catch all poop. If needed, clip the straps right above the chicken's tail to keep the poo pouch in place. You can also purchase additional disposable pads (ASIN B0DGZFTG3C) from our Amazon store to make clean up even easier. EASY TO WEAR, Adjustable - Our design has been tested and iterated on over 10+ times to ensure the perfect fit. You can either have your chicken step into the diaper or strap the diaper around your chicken. Adjust the straps as necessary to ensure a snug fit. Note: The straps should fit snugly in the nook/armpit of your chicken's wings. It should NOT restrict any freedom of movement of the wings. These chicken diapers are made from the same soft fabric used in baby clothes. They feature a spacious, waterproof poop pouch and adjustable straps for a secure, comfortable fit. Ideal for bantam-sized chickens that weigh 3-4 lb: e.g. Bantam Silkie, Ameraucana, Ancona, Ayam, Leghorn, Polish, Sumatra, Old English, Modern Game. Refer to size chart for details. *If the straps are not long enough, strap extenders are sold separately as an add-on, in our Amazon store (ASIN B0DVYBPP59). * The chest fabric should sit below the crop, if not, fold and pin the front portion down*