Solo cups offer superior rigidity for your cold beverage needs. Solo cups are made with at least 70% renewable resources. Sustainable Features: Compostable in a commercial compost facility which may not exist in your community. Not suitable for backyard composting. Meets the ASTM standard D6868 for compostability. We source fibers certified under the SFI chain of custody. Accepted at all Cedar Grove commercial composting facilities. Wet wax coating offers superior rigidity as compared to a Double-Side Poly cold cup. (DSP) Wax is a preferable material for heavier cold applications such as thick milkshakes or smoothies. Cold applications. Made with 65% plant-based renewable resources.