Allerease Bed Bug Protection Kit - Twin/XL Allerease Bed Bug Protection Kit - Pillow & Mattress Encasement Waterproof protection, Allergen protection, Bedbug barrier, Dust mites, Pollen, Pet dander. Size: Twin XL stretches to fit 14" deep mattress. Kit includes: 1 twin xl size mattress encasement 39" x 80", 1 standard/queen size pillow encasement 20" x 28" Color - white.