\documentclass{article}
\usepackage[T1]{fontenc}
\usepackage[sfdefault]{josefin}
\usepackage{microtype}
\usepackage{lipsum}
\begin{document}

\section*{Josefin Sans}

\subsection*{Regular}
\lipsum[1]


\textit{\lipsum[2]}

\subsection*{Bold}

\textbf{\lipsum[3]}

\textbf{\textit{\lipsum[4]}}


\subsection*{Medium}

{\josefinmedium \lipsum[8]}

{\josefinmedium \textit{\lipsum[10]}}


\subsection*{SemiBold}
{\josefinsemibold \lipsum[8]}

{\josefinsemibold \textit{\lipsum[10]}}

\subsection*{Light}
{\josefinlight \lipsum[7]}

{\josefinlight \textit{\lipsum[9]}}

\subsection*{ExtraLight}

{\josefinextralight \lipsum[7]}

{\josefinextralight \textit{\lipsum[9]}}

\subsection*{Thin}
{\josefinthin \lipsum[10]}

{\josefinthin \textit{\lipsum[12]}}


\subsection*{Numbers}

1234567890

\end{document}
