This will vary depending on your destination. WorldStrides will provide you with all the details in you quote letter.
As a guide:
• Clothing: a waterproof jacket and pants with warm, breathable layers underneath. The jacket and pants can be hired. Other options are waterproof snow boots or any waterproof/water-resistant, sturdy footwear. Gum boots and Ugg boots are unsuitable for snow.
• Bedding: Bedding is included in all international snow tours. Within Australia there are some locations that require you to bring your own. Make sure you check your booking details to see if bedding is included in your tour. If bedding is not included you must bring a sleeping bag or top sheet and doona/quilt cover and a bath towel. The following will be supplied by the lodge: pillow, pillowslip, mattress protector, fitted sheet and bathmat.
If your group is staying at the Snowbird at Mount Hotham or Cooroona or Halley’s Lodge at Falls Creek, you can hire bed linen for $25 per person per stay