CINECA aims to foster the research and technology transfer capability of its High-Performance Computing (HPC) infrastructure, by including a new state-of-the-art public CLOUD. The HPC cloud infrastructure stands out by providing 80-state-of-the-art node servers for high performance calculations each equipped with 2 Broadwell 18-core processors (E5-2697 v4) and 250 GB of DDR4 RAM and interconnected via a capable 25 Gb/s Mellanox Ethernet network. Complete the infrastructure with a dedicated CEPH storage of 200 TB capacity in high availability (RAID6). This cloud infrastructure is tightly connected to a GSS storage of 6PB seen by all other infrastructure. This setup enables the use of all available HPC systems (Tier-0 Marconi, Tier-1 Galileo), addressing HPC workloads in conjunction with cloud resources. The CLOUD.HPC infrastructure integrates and completes the HPC ecosystem, providing a tightly-integrated infrastructure that covers both high performance and high flexible computing.