Grass + Air Kids' Rainwear. We want to make it easy for kids to get outside and play, whatever the weather. That’s why our kids’ raincoats and waterproofs have been specially designed to withstand the rigours of everyday life, keeping your youngsters protected, warm and dry. Available in sizes from 12 – 18 months to 10 years. With our fun and practical rainwear, your kids will never want to stay inside!