Eina with PT Serif in action on weareframework.co.uk

Under the hood

.header-1 { font-family: Eina-03, "Segoe UI", "Helvetica Neue", Arial, "Noto Sans", "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol", "Noto Color Emoji", -apple-system, sans-serif; font-size: 200px; font-style: normal; font-weight: 600; letter-spacing: 0px; line-height: 200px; text-transform: none; color: #1C1F2F; }
.header-2 { font-family: Eina-03, "Segoe UI", "Helvetica Neue", Arial, "Noto Sans", "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol", "Noto Color Emoji", -apple-system, sans-serif; font-size: 35px; font-style: normal; font-weight: 400; letter-spacing: normal; line-height: 44px; text-transform: none; color: #1C1F2F; }
.header-3 { font-family: "PT Serif", Cambria, "Hoefler Text", Utopia, "Liberation Serif", "Nimbus Roman No9 L Regular", Times, "Times New Roman", serif; font-size: 200px; font-style: normal; font-weight: 400; letter-spacing: 0px; line-height: 200px; text-transform: none; color: #1C1F2F; }

Eina is available from Fonts.com and MyFonts.