Difference between network card size and capacity

When I run lshw -C network I get

  *-network:1
       description: Ethernet interface
       product: Ethernet Connection (6) I219-V
       vendor: Intel Corporation
       physical id: 1f.6
       bus info: pci@0000:00:1f.6
       logical name: eno1
       version: 30
       serial: 1c:69:7a:0d:82:69
   --> size: 100Mbit/s         
   --> capacity: 1Gbit/s       
       width: 32 bits
       clock: 33MHz
       capabilities: pm msi bus_master cap_list ethernet physical tp 10bt 10bt-fd 100bt 100bt-fd 1000bt-fd autonegotiation
       configuration: autonegotiation=on broadcast=yes driver=e1000e driverversion=3.2.6-k duplex=full firmware=0.4-4 ip=192.168.30.239 latency=0 link=yes multicast=yes port=twisted pair speed=100Mbit/s
       resources: irq:133 memory:c0b00000-c0b1ffff

What's the difference between size and capacity in this case?